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Use the method that matches your control of the page. If you own the banner markup, add data-html2canvas-ignore to its outer element. If you cannot edit the markup, pass an ignoreElements predicate that identifies the banner. If you want the live page untouched, remove or adjust the banner in html2canvas’s cloned document with onclone. These options exclude elements from html2canvas’s DOM reconstruction; they do not create a native browser screenshot or bypass cross-origin iframe security.
Choose the right removal method
html2canvas walks the readable DOM and builds a canvas representation. It does not copy the browser’s final pixels. That distinction matters: a banner that is accessible in the page DOM can be excluded, while a banner inside an inaccessible, cross-origin iframe cannot be selected by the parent page.
| Method | Use it when | What changes | Main consideration |
|---|---|---|---|
data-html2canvas-ignore |
You control the banner template | A marked element and its subtree are skipped | Put the attribute on the banner wrapper |
ignoreElements |
You cannot change the source markup | A predicate filters matching elements | Use a specific, verified selector |
onclone |
You need capture-only DOM edits | The cloned document is changed before rendering | The live page remains unchanged |
All three options are documented by the html2canvas project: see the examples, configuration options, and the clone-callback documentation.
1. Add data-html2canvas-ignore when you own the banner
The declarative approach is usually the easiest to audit. Add the documented attribute to the outermost consent element, not merely to a close button or one paragraph. html2canvas then skips that element and all of its descendants.
<div class="cookie-banner" data-html2canvas-ignore>
<p>We use cookies to improve the site.</p>
<button type="button" id="accept-cookies">Accept</button>
</div>Capture after the banner has been inserted into the document:
import html2canvas from 'html2canvas';
const target = document.querySelector('#page');
const canvas = await html2canvas(target);
document.querySelector('#output').src = canvas.toDataURL('image/png');If your application renders the banner asynchronously, wait for the banner component (or for the page’s ready state) before calling html2canvas. The attribute is only useful when it is present in the DOM that html2canvas receives.
2. Use ignoreElements when the markup cannot be changed
ignoreElements is a function. Return true for the banner element you want excluded and false for everything else. Match a stable class, ID, data attribute, or another identifier belonging specifically to your consent component.
import html2canvas from 'html2canvas';
const bannerSelector = '[data-consent-banner], .cookie-banner';
const target = document.querySelector('#page');
const canvas = await html2canvas(target, {
ignoreElements: (element) => element.matches(bannerSelector),
});The selector above is illustrative. Cookie-management vendors and site themes use different markup, so inspect the page and replace it with the selector that actually identifies your wrapper. Avoid broad rules such as element.tagName === 'DIV' or “ignore every button”; those can remove legitimate content from the capture.
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document.querySelectorAll('[data-consent-banner], .cookie-banner').lengthA result of zero means the selector is wrong, the banner has not rendered yet, or the banner is not in this document.
3. Edit only the cloned document with onclone
Use onclone when the source page should remain exactly as the visitor sees it, but the render copy needs a removal or another capture-specific adjustment. html2canvas calls the callback with the cloned document used for rendering.
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import html2canvas from 'html2canvas';
const target = document.querySelector('#page');
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
clonedDocument.querySelector('.cookie-banner')?.remove();
},
});Removing the node in the clone does not dismiss consent, change cookies, or alter the live page. If you need to preserve layout while hiding the banner, change its cloned styles instead:
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const banner = clonedDocument.querySelector('.cookie-banner');
if (banner) {
banner.style.display = 'none';
}
}Removing versus hiding can produce different layout results. Removing a normal-flow banner lets content move upward; setting display: none does the same. If the banner is fixed or absolutely positioned, either operation generally leaves the underlying layout unchanged. Verify the result for your component.
A complete browser example
This example waits for a target element, excludes a banner in the cloned document, and downloads a PNG. It assumes html2canvas is installed with a package manager or loaded from a CDN as described in the project’s Getting Started guide.
import html2canvas from 'html2canvas';
async function captureWithoutConsent() {
const target = document.querySelector('#page');
if (!target) throw new Error('Capture target #page was not found');
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
const banner = clonedDocument.querySelector(
'[data-consent-banner], .cookie-banner'
);
banner?.remove();
},
backgroundColor: '#ffffff',
useCORS: true,
});
const link = document.createElement('a');
link.download = 'page-without-cookie-banner.png';
link.href = canvas.toDataURL('image/png');
link.click();
}
captureWithoutConsent().catch(console.error);useCORS can help with images that explicitly permit cross-origin loading, but it does not grant access to arbitrary cross-origin documents or frames. It is unrelated to banner filtering.
Cross-origin iframe limits
If the consent UI is inside an iframe from another origin, the parent page cannot read that frame’s contentDocument because of browser same-origin protections. Consequently, a parent-page attribute, ignoreElements predicate, or onclone callback cannot select the iframe’s internal banner.
- If the iframe is same-origin, inspect its document and apply the relevant method inside that document.
- If it is cross-origin, capture content outside the frame or use a consent/capture configuration provided by the iframe owner.
- Do not assume that visually covering an iframe with another element removes its pixels from html2canvas; the iframe remains an inaccessible rendering boundary.
These restrictions are part of html2canvas’s documented model, not a missing selector trick. Read the project’s About documentation for the library’s rendering and security limitations.
Timing, selectors and layout checks
Wait for the banner state you intend to capture
Single-page applications can insert a consent component after your capture call. Wait for a known page condition, a framework render promise, or a short polling loop that confirms the selector exists. A fixed delay is less reliable than observing a real state transition.
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Target the wrapper, not a child
Marking or removing only the text node, close button, or backdrop can leave the banner’s background, padding, or shadow. Select the outer wrapper that owns the entire consent subtree.
Check fixed overlays and stacking
A fixed banner may overlap the target even when its selector is correct if another copy is inserted later. In the clone callback, count matches and remove every intended instance:
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onclone: (clonedDocument) => {
clonedDocument
.querySelectorAll('[data-consent-banner], .cookie-banner')
.forEach((node) => node.remove());
}Confirm the output rather than the live page
Open the generated image and check the bottom edge, sticky headers, and any backdrop. The browser page can look correct while the reconstructed canvas differs because html2canvas supports only the styles and content it can read.
Troubleshooting common failures
| Symptom | Likely cause | Fix |
|---|---|---|
| The banner still appears | The selector does not match, the callback ran before insertion, or another banner instance exists | Inspect the rendered DOM, test querySelectorAll, wait for insertion, and use querySelectorAll in onclone when necessary |
| Other content disappears | The predicate is too broad | Replace tag-wide or button-wide matching with a banner-specific class, ID, or data attribute |
| The live page changes | Removal was performed on the source document rather than the clone | Move the edit into onclone, or use data-html2canvas-ignore without mutating the DOM |
| Only part of the banner is gone | The attribute or selector was applied to a child | Target the outer banner container and its subtree |
| An iframe banner cannot be selected | The frame is cross-origin | Use an owner-provided configuration, capture outside the frame, or handle a same-origin frame from its own document |
| The canvas differs from visible pixels | html2canvas reconstructs from DOM information and may not support every style or resource | Check the supported content, simplify capture-only styles, and treat the output as a DOM render rather than a native screenshot |
| Images are blank or taint the canvas | Image origin or server headers prevent readable loading | Serve images with suitable CORS headers, use same-origin assets, or omit inaccessible resources; useCORS cannot bypass server policy |
Performance and reliability considerations
- Capture the smallest element that contains the required content instead of
document.bodywhen possible. - Use one filtering strategy consistently; a narrow selector is cheaper to reason about and less likely to remove content.
- Wait for fonts, images, and asynchronous components before capturing if visual completeness matters.
- For long pages, expect more DOM traversal and memory use. A full-page canvas can be expensive; split captures when your application permits it.
- Do not treat html2canvas as a security boundary. It cannot read content the browser’s same-origin policy hides.
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Does data-html2canvas-ignore hide the banner for visitors?
No. It tells html2canvas to skip the element during rendering; it does not alter what visitors see.
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Can I remove a banner after accepting cookies?
Yes, if your consent code removes or hides it before capture. The html2canvas methods described here are capture controls, not a replacement for consent management.
Which method is safest for an uneditable third-party component?
Use ignoreElements with a selector that uniquely identifies the component, or onclone if you need capture-only changes. Neither can inspect a cross-origin iframe.
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Frequently Asked Questions
Can I use a CSS selector with data-html2canvas-ignore?
No. The attribute is placed directly on the element. For selector-based matching, use the ignoreElements predicate or remove the node in onclone.
Will removing the banner improve cookie compliance?
No. These techniques affect the screenshot render only. Keep your site’s consent logic and disclosure behavior unchanged.
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