If a Font Awesome icon is missing from an html2canvas image on an iPhone or iPad, first determine whether it is missing from the live page or only from the generated canvas. A live-page failure usually means a Font Awesome setup or asset-loading problem. An icon that is visible live but absent from the canvas is a DOM-reconstruction problem: html2canvas rebuilds supported DOM and CSS rather than taking a browser screenshot. Reduce the case to one icon, verify the loaded assets, and then test an inline SVG or text fallback in html2canvas’s cloned document with onclone. No documented option is a guaranteed fix for every current iOS and Font Awesome combination.
Start with the symptom on the iPhone or iPad
Open the page on the affected device and inspect the original element before calling html2canvas. This split determines the next step.
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| What you see | Most useful first action |
|---|---|
| The icon is absent on the live page and in the canvas | Check Font Awesome setup, icon name/style, and CSS, font, or SVG requests. |
| The icon is visible live but absent only in the canvas | Test html2canvas reconstruction with a minimal case and an onclone substitution. |
| The icon is present but its edges are cut off | Inspect line height, parent height, padding, and overflow:hidden. |
| The entire canvas is blank or drawing fails | Investigate canvas size, memory limits, and cross-origin images separately from the icon. |
Record iOS or iPadOS, browser, html2canvas version, Font Awesome version, rendering method (web font, SVG+JS, or inline SVG), and whether assets are same-origin. These details make a reproducible bug report possible.
Why the live page and canvas can disagree
html2canvas traverses the DOM and reconstructs a representation from properties it understands; it does not capture the already-composited browser screen. A browser can successfully display a Font Awesome glyph while the reconstruction path fails to reproduce the font, pseudo-element, SVG, or style that produced it.
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Browser security still applies. The useCORS option is documented for images, not as a universal repair switch for web fonts or icons. Cross-origin policy cannot be bypassed by html2canvas. The FAQ also notes that iOS canvas limits can depend on device RAM, so a large page may fail even when a one-icon test succeeds.
Fix a Font Awesome icon that is missing from the live page
Confirm the integration and style
Use the Font Awesome setup you actually installed: the correct Kit or stylesheet, and the correct family/style class for the icon. A regular, solid, brands, or other style mismatch can leave an empty element. Check the icon’s name against the version in your project instead of copying a class from a different release.
Check the network result
On a desktop Safari Web Inspector session attached to the iPhone or iPad, inspect requests for Font Awesome CSS, font files, and SVG assets. A 404, blocked request, incorrect MIME type, authentication failure, or Content Security Policy error must be fixed at the server or deployment layer. Font Awesome’s troubleshooting guidance recommends checking asset paths and setup when icons do not load.
Verify the actual element
Inspect the element’s computed font-family, font-weight, pseudo-elements, and dimensions. If the icon is generated with ::before and a Unicode content value, confirm that the expected Font Awesome font is applied and that the pseudo-element has non-empty content. If your integration uses SVG+JS, confirm that the replacement SVG is present in the live DOM rather than assuming the original <i> remains.
Build a minimal reproduction before changing options
- Create a page containing one icon, one surrounding element, and the smallest stylesheet that reproduces the failure.
- Render that element with the same html2canvas version used in production.
- Test on the affected iOS device and browser, not only desktop Safari.
- Compare a same-origin asset with the production asset origin.
- Capture console errors and failed network requests.
A minimal case tells you whether the problem follows the icon method, the asset origin, the page size, or a particular iOS/browser release. The historical html2canvas issue #1610 is not current iOS proof: it describes html2canvas 1.0.0-alpha.12 and Safari 10.1.2 on OS X Yosemite, reported in 2018.
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Use onclone to test an SVG or text fallback
When the icon is visible live but disappears from the output, alter only html2canvas’s cloned document. The original page remains unchanged. This is a diagnostic and implementation technique, not a vendor-guaranteed fix.
import html2canvas from 'html2canvas';
const target = document.querySelector('#card');
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
const clonedIcon = clonedDocument.querySelector('[data-fa-fallback]');
if (!clonedIcon) return;
// Test ordinary text first. Use a label that is meaningful if exposed.
clonedIcon.textContent = '★';
clonedIcon.removeAttribute('aria-hidden');
clonedIcon.setAttribute('aria-label', 'Featured');
// Or replace the element with a literal inline SVG:
// clonedIcon.outerHTML = `<svg xmlns="http://www.w3.org/2000/svg"
// viewBox="0 0 24 24" width="24" height="24" aria-label="Featured"
// role="img"><path fill="currentColor"
// d="M12 2l3.09 6.26L22 9.27l-5 4.87L18.18 21
// 12 17.77 5.82 21 7 14.14 2 9.27l6.91-1.01L12 2z"/></svg>`;
}
});
document.body.appendChild(canvas);Keep the fallback’s dimensions, color, and alignment close to the original so the test answers one question: is the web-font or SVG rendering path the part that fails? Compare the generated image on the affected device. If text works but the Font Awesome glyph does not, choose an SVG or another rendering path only after checking visual fidelity and accessibility requirements.
Font Awesome documents browser support and describes both web-font and SVG approaches. Those documents establish the available methods, not a universal html2canvas-on-iOS preference.
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If only the top, bottom, or side of the glyph is cut off, inspect the containing box. Font Awesome’s icon-canvas guidance describes clipping when a tight-height parent uses overflow:hidden. Increase the parent’s height or vertical padding, adjust line height, or remove clipping while rendering. That explanation applies to truncated edges; it does not explain a completely blank icon.
Handle cross-origin images and canvas failures independently
A page can contain both an icon problem and a separate canvas-security problem. If images come from another origin, that server must permit the browser request with suitable CORS headers. html2canvas can attempt CORS image loading with useCORS: true:
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const canvas = await html2canvas(document.querySelector('#card'), {
useCORS: true,
onclone: (doc) => {
// Keep the icon substitution here if your minimal test needs it.
}
});This setting does not override content policy and does not repair a cross-origin Font Awesome font. A documented proxy route is another option for eligible images, but it still requires a server you control or trust. If the output is blank on a large page, render a smaller element, reduce scale, remove huge images, and test device memory limits before changing icon code.
Troubleshooting by symptom
Live icon is blank, and the request is 404
Correct the CSS, Kit, font, or SVG URL and redeploy. Confirm the response on the device, not just in a desktop cache.
Live icon is blank, but assets load
Check the icon name, style class, computed font family and weight, pseudo-element content, and whether a CSS rule hides the element. Try a known icon from the same installed set.
Live icon works; canvas omits it
Reduce to one icon and test the onclone text or inline-SVG replacement. Keep the original and fallback in separate tests so you can identify the rendering path that differs.
Only edges are clipped
Increase parent height or vertical padding and inspect overflow:hidden and line height.
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Canvas throws a security or taint error
Find cross-origin images, configure their response headers, and use useCORS only for image loading. Do not treat it as a font fix.
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Canvas is empty or crashes on iOS
Render a smaller element, lower the output scale, and test the device’s memory constraints. Record the exact iOS, browser, html2canvas, and Font Awesome versions before filing an issue.
Choose a rendering path deliberately
| Path | When to test it | Trade-off |
|---|---|---|
| Font Awesome web-font glyph | Your live page already depends on CSS and the font loads reliably. | Compact and familiar, but reconstruction may not reproduce the glyph. |
| Font Awesome SVG or literal inline SVG | You need deterministic geometry in the cloned DOM. | Usually explicit to serialize, but you must preserve sizing, color, and accessible labeling. |
| Ordinary text fallback | You need a quick diagnostic or a deliberately simple symbol. | Font and glyph appearance can vary; it may not match the Font Awesome artwork. |
Compare asset origin policy, appearance, fallback text, and accessibility. The available documentation does not provide a current-iOS reliability benchmark for these choices.
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For a URL such as the page containing your icon, use the documented endpoint:
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FAQ
Does useCORS: true fix Font Awesome fonts?
No. It is documented for image loading and still requires the image server’s CORS response headers.
Is the old Safari issue proof of a current iOS bug?
No. Issue #1610 concerns a 2018 desktop Safari and an alpha html2canvas release, so test the exact versions and device you support.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsShould I switch permanently to SVG?
Only after a minimal test confirms the SVG path meets your visual and accessibility requirements; the documentation does not prescribe one universal path.
Frequently Asked Questions
Can a pseudo-element Font Awesome icon be captured by html2canvas?
It may be reconstructed, but a missing glyph should be tested with a minimal case and an explicit text or inline-SVG substitution in `onclone`.
Why does the icon look cropped instead of missing?
A tight parent, insufficient line height or padding, and `overflow:hidden` can clip its edges; adjust the container rather than changing CORS settings.
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