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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

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Contributor

Choose a reason for hiding this comment

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

Copy link
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Contributor

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

Copy link
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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Force GitHub README to respect dark mode (function() { var style = document.createElement('style'); style.textContent = ' .markdown-body { color-scheme: dark light; } .markdown-body pre { background: #161b22 !important; } .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; } .markdown-body table th, .markdown-body table td { border-color: #30363d !important; } .markdown-body img { background: #0d1117; } .markdown-body blockquote { border-left-color: #8b949e; } .markdown-body hr { border-color: #30363d; } '; document.head.appendChild(style); })(); } } catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

Copy link
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Contributor

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

Copy link
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Contributor

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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Contributor

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Highlight search terms from Google/DuckDuckGo/Bing referrer (function() { var ref = document.referrer; var terms = []; if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) { var url = new URL(ref); var q = url.searchParams.get('q') || url.searchParams.get('p'); if (q) { terms = q.split(/\s+/).filter(function(t) { return t.length > 2; }); } } if (terms.length === 0) return; var style = document.createElement('style'); style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }'; document.head.appendChild(style); function highlight(node) { if (node.nodeType === 3) { // text node var text = node.textContent; var found = false; terms.forEach(function(term) { var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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Contributor

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

Copy link
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Contributor

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

Copy link
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Contributor

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ' Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

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Choose a reason for hiding this comment

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

Copy link
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Contributor

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

Copy link
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Contributor

Choose a reason for hiding this comment

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ' Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
Expand Down
80 changes: 80 additions & 0 deletions docs/devGuide/design/serverSideRendering.md
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,80 @@
{% set title = "Server Side Rendering" %}
<span id="title" class="d-none">{{ title }}</span>

<frontmatter>
title: "{{ title }}"
layout: devGuide.md
pageNav: default
</frontmatter>

# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

Copy link
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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

Copy link
Copy Markdown
Contributor

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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

Copy link
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Contributor

Choose a reason for hiding this comment

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)

, 'i'); if (__m === '*' || __re.test(location.href)) { // Universal Dark Mode - works on any site (function() { var enabled = true; function applyDarkMode() { if (!enabled) return; // Create style element if it doesn't exist var style = document.getElementById('universal-dark-mode-style'); if (!style) { style = document.createElement('style'); style.id = 'universal-dark-mode-style'; document.head.appendChild(style); } // Dark mode CSS - inverts colors but preserves images/video style.textContent = ' /* Invert everything except media */ html { filter: invert(1) hue-rotate(180deg) !important; background: #1a1a2e !important; } /* Restore images, videos, iframes, canvas */ img, video, iframe, canvas, svg, picture, [style*="background-image"] { filter: invert(1) hue-rotate(180deg) !important; } /* Preserve specific elements that should not be inverted */ .no-dark-mode, .no-dark-mode *, [data-theme="light"], [data-theme="light"], .ace_editor, .ace_editor *, .CodeMirror, .CodeMirror *, .monaco-editor, .monaco-editor *, .markdown-body pre, .markdown-body pre *, .highlight, .highlight *, pre code, pre code * { filter: none !important; } /* Fix common UI elements */ .modal, .popup, .dropdown-menu, .tooltip, .popover { filter: invert(1) hue-rotate(180deg) !important; background: #2d2d44 !important; border-color: #444 !important; } /* Scrollbars */ ::-webkit-scrollbar { background: #1a1a2e !important; } ::-webkit-scrollbar-thumb { background: #444 !important; } ::-webkit-scrollbar-thumb:hover { background: #555 !important; } /* Selection */ ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; } ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; } '; } function removeDarkMode() { var style = document.getElementById('universal-dark-mode-style'); if (style) style.remove(); } // Toggle with Alt+Shift+D document.addEventListener('keydown', function(e) { if (e.altKey && e.shiftKey && e.key === 'D') { e.preventDefault(); enabled = !enabled; if (enabled) { applyDarkMode(); console.log('[Universal Dark Mode] Enabled'); } else { removeDarkMode(); console.log('[Universal Dark Mode] Disabled'); } } }); // Apply on load applyDarkMode(); // Re-apply on dynamic content var observer = new MutationObserver(function(mutations) { if (enabled && !document.getElementById('universal-dark-mode-style')) { applyDarkMode(); } }); observer.observe(document.head, { childList: true }); console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle'); })(); } } catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); } })(); })(); Update Developer Guide on SSR by wxwxwxwx9 · Pull Request #1570 · MarkBind/markbind · GitHub
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1 change: 1 addition & 0 deletions docs/_markbind/layouts/devGuide.md
Original file line numberDiff line numberDiff line change
Expand Up@@ -13,6 +13,7 @@
* Design :expanded:
* [Project Structure]({{baseUrl}}/devGuide/design/projectStructure.html)
* [Architecture]({{baseUrl}}/devGuide/design/architecture.html)
* [Server Side Rendering]({{baseUrl}}/devGuide/design/serverSideRendering.html)
* [Writing Plugins]({{baseUrl}}/devGuide/writingPlugins.html)
* [Project management]({{baseUrl}}/devGuide/projectManagement.html)
* Appendices :expanded:
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title: "{{ title }}"
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# {{ title }}

<div class="lead">

MarkBind makes use of Server-side Rendering (SSR) for its pages.

To ensure SSR works properly, there are certain rules that developers should adhere to.

This page will describe SSR in general and elaborate on the things that developers should take note of when contributing to MarkBind.
</div>

## Pre-requisite Knowledge

To deal with SSR, it is important to first have a good understanding of two things:
1. Vue
2. MarkBind's Packages

### Understanding Vue

Here is a short list of questions to check your understanding of Vue:
- What is a Vue instance?
- What does it mean to compile Vue?
- What are render functions?
- Are there any differences between compiling Vue on client-side versus server-side?
- What is the difference between compiling and rendering?

### MarkBind's Packages

There are four packages in MarkBind's codebase:
1. cli
2. core
3. core-web
4. vue-components

You may refer to MarkBind's [project structure](projectStructure.md) to get a better understanding of how the packages work together.

## What is Server-side Rendering and Why?

In MarkBind's context, SSR refers to the generation of proper HTML strings from Vue components on the server (core library) instead of shifting that responsibility to the client-side (browser).

The main motivation that we had for introducing SSR into MarkBind is to enhance user experience by resolving the unsightly issue of Flash-of-Unstyled-Content (FOUC), which occurs due to our reliance on Client-side Rendering (CSR).

## Client-side Hydration

SSR and Client-side Hydration are 2 concepts that go hand-in-hand. Essentially, once we produce the static HTML via SSR and send it over to the client-side, Vue on the client-side will execute what is known as Client-side Hydration on the static HTML.

During the hydration process, Vue essentially `diff` your SSR HTML markup against the virtual DOM generated by the render function on the client-side. If any difference is found, meaning that the application that we have on the client-side (the virtual DOM tree) differs from the SSR HTML mark-up that we send to the client, Vue will reject the SSR HTML output, bail Client-side Hydration, and execute full CSR.

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essentially diff -> compares


This is known as "Hydration Issue" and it is one of the main challenges you will face with SSR in MarkBind.

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Could add an alert box here highlighting that this comparison dosen't execute in production vue build. Rather, if there are any runtime errors resulting from hydration errors, then full csr is re-executed.

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in case anyone tests this with production builds

## Penalties of Hydration Issue

When hydration fails, on top of the wasted time and effort in executing SSR, we will also incur the additional time penalty of executing Client-side Hydration (where CSR will follow afterwards).

Fortunately, even if we face hydration issues and execute full CSR, the FOUC problem will still be resolved nonetheless. The reason for this is because the SSR HTML markup should resemble the CSR HTML markup to a large extent.

Supposedly, hydration issues typically occurs due to minor differences between client-side rendered virtual DOM tree and the server-rendered content. Of course, this is assuming that we are adhering to the concept of "universal application" as much as possible, which will be explained in the following section.

## Avoiding Hydration Issue

Conceptually, to prevent hydration issue, what we should always strive to achieve is a "universal application".

It is not difficult to achieve a "universal application" per-se because we merely have to ensure two things:
1) the state data are the same between client-side and server-side.

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state data -> initial state

2) after compiling and rendering the Vue page application, the SSR HTML mark-up is not modified.

However, beyond achieving a "universal application", there are also some more specific rules that we should adhere to, so that we do not run into hydration issue:

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Slight reorganisation since both are actually html spec issues:

However

there are also some more specific rules that we should adhere to -> note that the HTML spec should be adhered to. Some common mistakes are as such:

  • Having block-level elements within <p> tag
  • Having unknown ...

- Do not violate HTML spec as much as possible (e.g. having block-level elements within `<p>` tag).
- Having unknown HTML elements within our Vue application during compilation/rendering (though this can be easily resolved by adding `v-pre` to the unknown element, so that Vue will ignore that element during compilation).

Note that the list only included the common causes of hydration issue that MarkBind developers have ran into. There may be other causes of hydration issue that are not listed here (although unlikely).

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Could also add:

If you are unsure what elements are allowed within other elements, or what constitutes invalid HTML in general, a good resource to reference would be the [MDN Web Docs](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/span)