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Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994

Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle

Description

@rpkyle
rpkyle
opened on Nov 2, 2019

RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.

The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:

dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143 in b3b9de9

{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
CSS leaking - werkzeug HTML includes a bunch
of CSS on base html elements like `<body/>`
*/}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
* 67px of padding and margin between this
* iframe and the parent container.
* 67 was determined manually in the
* browser's dev tools.
*/
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}

This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:

image

The plot_ly function gets around this problem by embedding source from localhost, which is allowed:

<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.

Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.

@alexcjohnson

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, '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" + '
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
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Metadata
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No labels
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No branches or pull requests
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, '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('^' + ".*" + '
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
Metadata
Metadata
Assignees
Labels
No labels
No labels
Type
No type
Projects
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None yet
Development
No branches or pull requests
Issue actions

, '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('^' + ".*" + '
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
Metadata
Metadata
Assignees
Labels
No labels
No labels
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No type
Projects
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None yet
Development
No branches or pull requests
Issue actions

, '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" + '
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
Metadata
Metadata
Assignees
Labels
No labels
No labels
Type
No type
Projects
No projects
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, '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('^' + ".*" + '
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
Metadata
Metadata
Assignees
Labels
No labels
No labels
Type
No type
Projects
No projects
Milestone
No milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, '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); }
})();
})();
Stack traces do not render in the dev tools UI when using RStudio's viewer pane · Issue #994 · plotly/dash · GitHub
Skip to content
Stack traces do not render in the dev tools UI when using RStudio's viewer pane #994
Closed
#996
Closed
Stack traces do not render in the dev tools UI when using RStudio's viewer pane#994
#996
Assignees
rpkyle
Description
@rpkyle
rpkyle
opened on Nov 2, 2019
RStudio's IDE does not allow embedding of iframe elements which include content from "external" URLs, as noted in rstudio/rstudioapi#2.
The way that dash-renderer currently handles stack traces places them into an iframe so that Werkzeug's CSS doesn't affect the display of the rest of the page:
dash/dash-renderer/src/components/error/FrontEnd/FrontEndError.react.js

Lines 111 to 143
in
b3b9de9
{typeoferror.html!=='string' ? null : (
<divclassName="dash-be-error__st">
<divclassName="dash-backend-error">
{/* Embed werkzeug debugger in an iframe to prevent
 CSS leaking - werkzeug HTML includes a bunch
 of CSS on base html elements like `<body/>`
 */}
<iframe
srcDoc={error.html
.replace(
'</head>',
`<style type="text/css">${werkzeugCss}</style></head>`
)
.replace(
'="?__debugger__',
`="${base}?__debugger__`
)}
style={{
/*
 * 67px of padding and margin between this
 * iframe and the parent container.
 * 67 was determined manually in the
 * browser's dev tools.
 */
width: 'calc(600px - 67px)',
height: '75vh',
border: 'none',
}}
/>
</div>
</div>
)}
This has the unfortunate consequence of showing no stack trace within RStudio, though it appears properly in standalone browsers:
image
The plot_ly function gets around this problem by embedding source from localhost, which is allowed:
<iframe class="gwt-Frame ace_editor_theme" src="http://localhost:29325/session/viewhtml98b753d4ffc6/index.html?viewer_pane=1" style="width: 100%; height: 100%; position: absolute; left: 0px; top: 0px; right: 0px; bottom: 0px; background-color: rgb(255, 255, 255);"></iframe>

We can preserve the existing behaviour in the renderer for Python apps by implementing a condition which checks whether the content of the stack trace begins with <!DOCTYPE HTML>, then enclose in an iframe if true.
Dash for R would then be modified to send back a stack trace that is raw text, which the renderer will insert directly within <pre> tags (since the above condition would be false), and this should enable support for stack trace display in the RStudio viewer as well as standalone browsers.
@alexcjohnson
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