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CSS Guidelines by @csswizardry

A high-level overview of CSS best practices

This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…

These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.

This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.

I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.

Follow me on Twitter and tweet these guidelines.

Copyright 2012 Harry Roberts

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
About
High-level guidelines from writing manageable, maintainable CSS
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1 watching
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
About
High-level guidelines from writing manageable, maintainable CSS
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
About
High-level guidelines from writing manageable, maintainable CSS
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
About
High-level guidelines from writing manageable, maintainable CSS
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
About
High-level guidelines from writing manageable, maintainable CSS
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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CSS Guidelines by @csswizardry
A high-level overview of CSS best practices
This document covers a very high-level overview of what makes for good, performant, maintainable, manageable CSS over large projects. If you’re looking for round corners and drop-shadows, turn back now…
These guidelines are a culmination of the past several years of my career as a web developer. They are also a part the same guidelines I wrote for developers at Sky.
This document is a personal one, and for use at my place of work. I decided to share it in the hope that it might be useful to others but if you disagree with anything please remember; this is a document for me and Sky. You do not have to follow the advice given, nor do I provide any guarantee.
I decided to host this document on GitHub so that other organisations and individuals can fork it and make amends and additions as they see fit. I have licensed it under the Apache 2.0 License for formality, but all I do ask is that if you do fork, learn from and/or use any of this, please [give it a Tweet](https://twitter.com/intent/tweet?text=CSS+Guidelines+by+%40csswizardry%3A+https://github.com/csswizardry/CSS-Guidelines/blob/master/CSS Guidelines.md) and leave credits and attribution in place.
Follow me on Twitter and tweet these guidelines.
Copyright 2012 Harry Roberts
Licensed under the Apache License, Version 2.0 (the “License”);
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an “AS IS” BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
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High-level guidelines from writing manageable, maintainable CSS
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