Use html2canvas’s onclone callback to reveal hidden content in the temporary document used for rendering. Your live page stays unchanged, while the cloned element receives a usable display value, visibility, and layout before the canvas is created. Then pass that canvas to jsPDF. This is the safest pattern for elements hidden with display: none; the exact display mode must match the component’s layout.
Why hidden elements disappear
html2canvas does not capture a literal browser screenshot. It reconstructs an image from the DOM and CSS information it can read. An element with display: none has no layout box, so there is nothing for the renderer to paint. The same problem can occur when a parent is collapsed or when application state removes the element from the render tree. CSS support and browser resource restrictions also affect the result; consult the html2canvas documentation for its rendering limitations.
visibility: hidden and opacity: 0 are different cases: they may preserve layout, but they still prevent useful visible output. Off-screen positioning, zero dimensions, and framework-controlled conditional rendering require their own fixes. First determine how the element is hidden in the computed styles and DOM.
The recommended solution: reveal the cloned document
html2canvas provides onclone, called after it creates the document clone and before rendering. You can modify that clone without changing the source page. Query the cloned document, set the target’s display mode and visibility, and make sure the capture root contains the target.
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- Choose a capture root that includes the hidden element.
- In
onclone, query the clone rather than the live document. - Restore the component’s intended display mode, such as
block,flex, orgrid. - Set visibility to
visibleand repair any collapsed parent layout. - Allow images, fonts, and other asynchronous content to finish before exporting.
const root = document.querySelector('#capture');
html2canvas(root, {
onclone: (clonedDocument) => {
const target = clonedDocument.querySelector('#hidden-content');
if (!target) return;
target.style.display = 'block';
target.style.visibility = 'visible';
target.style.opacity = '1';
}
}).then((canvas) => {
// Add canvas output to your jsPDF document here.
});block is only an example. A flex component may need display: flex, and a grid component may need display: grid. If the target is inside a hidden parent, reveal that parent as well. If the element is outside #capture, changing it in the clone cannot add it to the canvas.
The callback and its “modify the cloned document without affecting the original” behavior are documented in the html2canvas configuration options.
Complete jsPDF export example
The following browser example captures a report, reveals a normally hidden appendix only in the clone, and inserts the resulting image into a PDF. Install compatible versions of html2canvas and jspdf using your project’s package manager, or load their browser bundles as appropriate for your application.
import html2canvas from 'html2canvas';
import { jsPDF } from 'jspdf';
async function exportPdf() {
const root = document.querySelector('#capture');
if (!root) throw new Error('Capture root not found');
const canvas = await html2canvas(root, {
backgroundColor: '#ffffff',
useCORS: true,
onclone: (clonedDocument) => {
const appendix = clonedDocument.querySelector('#hidden-content');
if (appendix) {
appendix.style.display = 'block';
appendix.style.visibility = 'visible';
appendix.style.opacity = '1';
}
// Reveal a collapsed wrapper if your UI hides one.
const wrapper = clonedDocument.querySelector('#appendix-wrapper');
if (wrapper) {
wrapper.style.display = 'block';
wrapper.style.height = 'auto';
wrapper.style.maxHeight = 'none';
wrapper.style.overflow = 'visible';
}
}
});
const image = canvas.toDataURL('image PNG');
const pdf = new jsPDF({ orientation: 'portrait', unit: 'mm', format: 'a4' });
const pageWidth = pdf.internal.pageSize.getWidth();
const pageHeight = pdf.internal.pageSize.getHeight();
const margin = 10;
const printableWidth = pageWidth - margin * 2;
const printableHeight = (canvas.height * printableWidth) / canvas.width;
let remaining = printableHeight;
let y = margin;
pdf.addImage(image, 'PNG', margin, y, printableWidth, printableHeight);
remaining -= pageHeight - margin * 2;
while (remaining > 0) {
pdf.addPage();
y = margin - (printableHeight - remaining);
pdf.addImage(image, 'PNG', margin, y, printableWidth, printableHeight);
remaining -= pageHeight - margin * 2;
}
pdf.save('report-with-appendix.pdf');
}
document.querySelector('#export')?.addEventListener('click', exportPdf);Use the image format and API signatures supported by the jsPDF version installed in your project. jsPDF’s type declarations expose html2canvas-related options, but repository master declarations are not a guarantee for every released runtime; verify against the version in your lockfile and its documentation at jsPDF’s type definitions.
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Alternative: temporarily reveal the live element
You can show the element in the real DOM, wait for layout, capture it, and restore its prior styles in a finally block. This can work when application code cannot be represented correctly in a clone, but it may flicker, trigger observers, alter focus, or expose content briefly to users. It also requires reliable waiting for fonts, images, and component updates.
async function captureByTemporarilyShowing(root, target) {
const old = {
display: target.style.display,
visibility: target.style.visibility,
opacity: target.style.opacity
};
try {
target.style.display = 'block';
target.style.visibility = 'visible';
target.style.opacity = '1';
await new Promise(requestAnimationFrame);
return await html2canvas(root);
} finally {
target.style.display = old.display;
target.style.visibility = old.visibility;
target.style.opacity = old.opacity;
}
}This is an application-level technique, not a canonical html2canvas recipe. Prefer onclone when the cloned layout can represent the component correctly.
What not to use
ignoreElements and data-html2canvas-ignore exclude nodes from rendering. They cannot make a hidden node appear. Remove those exclusions from the capture subtree when the content is intended for the PDF, then handle visibility with clone styles.
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Hidden-state checklist
display: none: assign an appropriate display mode inonclone.visibility: hidden: setvisibility: visible; inspect parents for the same rule.opacity: 0: set opacity to1in the clone if the content should be visible in the export.- Collapsed parent: restore height, max-height, overflow, and display on the parent.
- Conditional framework rendering: if the node is not present in the cloned DOM at all, render an export-only version inside the capture root; a style change cannot revive a node that was never rendered.
- Zero-size content: give the element dimensions and check computed styles in the clone.
- Wrong selector: log or assert that
clonedDocument.querySelector()returns a node.
Images, fonts, iframes, and cross-origin limits
Cross-origin images can taint a canvas or fail to load unless the server supplies suitable CORS headers and the request is configured correctly. useCORS: true is not a bypass for a server that denies cross-origin access. Proxied resources may be required. Cross-origin iframes have additional browser security restrictions, and html2canvas cannot reproduce every browser-rendered CSS feature. Check the project’s resource and browser limitations before treating a missing image or iframe as a visibility bug.
Wait for content that is inserted asynchronously. In application code, await image decoding where possible, ensure web fonts have loaded, and only then call html2canvas. A visible element with unfinished resources can still produce a blank or incomplete area.
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Troubleshooting common failures
The element is still missing
Confirm that the target is inside the node passed to html2canvas. Then verify the selector against clonedDocument, not document. Inspect every hidden ancestor and restore its layout. A component removed by conditional rendering must be rendered into the capture subtree first.
The layout is broken after revealing it
Replace block with the original component mode, such as flex or grid. Reapply required width, height, position, and overflow rules. Inline styles in the clone can override stylesheet rules without changing the live page.
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Look for cross-origin images, fonts, and iframes. Check response headers, CORS configuration, and whether a proxy is needed. A browser canvas cannot freely read pixels from an origin that has not granted access.
Only part of a long page appears
Check the capture root’s dimensions and overflow rules. Ensure lazy-loaded images are loaded before capture. Consider capturing sections separately and adding each section to jsPDF rather than creating one enormous canvas.
jsPDF rejects an option or method
Compare the code with the installed jsPDF release, not only the current repository declaration. APIs and option behavior can vary by version; pin compatible package versions and consult the release documentation.
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Performance and quality decisions
- Canvas scale: higher pixel density improves sharpness but increases memory use and PDF size.
- Capture scope: pass the smallest root that contains the intended report and revealed content.
- Pagination: section-by-section captures reduce peak memory and avoid browser canvas limits.
- Assets: optimize oversized images and wait for fonts instead of repeatedly retrying captures.
- Accessibility: a canvas-based PDF is an image; it does not preserve selectable text, semantic headings, or document structure automatically.
Or skip the browser setup
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Frequently Asked Questions
Can html2canvas capture an element with display: none directly?
No. Give it layout and visibility in the cloned document through onclone, or use a carefully managed live-DOM reveal.
Does onclone change my page?
No. Changes made to the callback’s cloned document are used for rendering and do not modify the original source document.
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Why does changing the child’s display have no effect?
A hidden or collapsed ancestor, a missing capture root, or conditional rendering may still prevent layout. Inspect the entire cloned subtree.
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