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To include an element hidden with CSS in an html2canvas image, reveal it in html2canvas’s cloned document with the onclone callback—not in the live page. Find the element in the clone and remove the hiding style, including any hidden ancestor that prevents it from rendering. Then ensure the revealed element has the size and position you want in the output.
Why html2canvas omits hidden elements
html2canvas does not take a native screenshot of the browser’s pixels. It traverses the DOM and reconstructs an image from page information and CSS properties it supports. Its visibility reference test treats elements styled display: none and visibility: hidden as hidden in the rendered result. Merely asking html2canvas to capture a hidden element does not make it visible.
The project documents onclone as a callback for modifying the cloned document that html2canvas renders. Changes there do not affect the original source document, making the callback the natural approach when the element should appear in the image but must not flash into view for users.
The examples below show the implementation pattern. Choose selectors and styles that fit your page; the callback is documented, but the exact CSS needed to restore a particular element’s layout depends on your application.
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Reveal the element in the cloned document
Example: a target hidden with display:none
Give the target a stable selector, then set an appropriate display value in the clone. Replace .receipt-preview with a selector for your element. If it should participate in normal layout, a value such as block may be suitable; if it is a flex or grid container, restore the corresponding display mode instead.
const target = document.querySelector('.receipt-preview');
if (!target) {
throw new Error('Could not find .receipt-preview');
}
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
const clonedTarget = clonedDocument.querySelector('.receipt-preview');
if (clonedTarget) {
clonedTarget.style.display = 'block';
}
}
});
document.body.appendChild(canvas);The target passed to html2canvas is the element from the original document, while onclone receives the cloned document. Select the corresponding element in the clone and change its styles there. The original target stays hidden on the live page.
Example: a target hidden with visibility:hidden
For visibility: hidden, set the clone’s visibility to visible. Unlike display: none, visibility-hidden elements generally retain layout space, so changing visibility may be enough when their geometry is already correct.
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const target = document.querySelector('.receipt-preview');
if (!target) {
throw new Error('Could not find .receipt-preview');
}
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
const clonedTarget = clonedDocument.querySelector('.receipt-preview');
if (clonedTarget) {
clonedTarget.style.visibility = 'visible';
}
}
});
document.body.appendChild(canvas);When a parent is hidden too
Check the target’s ancestors. If a parent has display: none or visibility: hidden, making only the child visible may not make it render. Reveal the necessary ancestor in the clone as well, and consider what restoring that ancestor means for the target’s size and placement.
const canvas = await html2canvas(target, {
onclone: (clonedDocument) => {
const clonedPanel = clonedDocument.querySelector('.preview-panel');
const clonedTarget = clonedDocument.querySelector('.receipt-preview');
if (clonedPanel) {
clonedPanel.style.display = 'block';
clonedPanel.style.visibility = 'visible';
}
if (clonedTarget) {
clonedTarget.style.display = 'block';
clonedTarget.style.visibility = 'visible';
}
}
});Only change what is necessary. A hidden element may have been intentionally removed from layout or positioned for a different interaction state. If you reveal a whole panel, its surrounding layout can change in the clone; set appropriate dimensions, positioning, or other styles if the captured composition requires them.
Choose the right capture approach
| Approach | What happens | Best fit |
|---|---|---|
Modify the clone with onclone |
The rendered clone gets the visibility and layout changes; the source document is not changed by those edits. | Include hidden content without changing what a visitor sees on the live page. |
| Temporarily change the live DOM | The actual page is changed while the content is revealed. Depending on timing and rendering, that state could be visible to a user. | Only when changing the live page is acceptable and the application controls the timing and restoration. |
Use ignoreElements or data-html2canvas-ignore |
The matching element is excluded from the output. | Omit unwanted controls or other content—not capture a hidden target. |
| Use a browser-native screenshot capability | The browser captures rendered pixels rather than reconstructing the page through html2canvas. | When pixel-level fidelity is the requirement and the browser or environment offers an appropriate capture method. |
The html2canvas FAQ advises against using html2canvas in browser extensions, where browser tab screenshot support is available. The exact native method depends on the browser and execution environment.
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Account for layout, CSS, and images
Restore useful geometry
An element with display: none has no rendered layout box while hidden, so its dimensions may not be useful until it is displayed. After revealing it in the clone, check whether it has the intended width, height, and position. If it should appear in a specific spot rather than affect surrounding content, set clone-only positioning or dimensions that reproduce the desired composition.
For an element whose content extends beyond the viewport, html2canvas’s FAQ suggests setting windowWidth and windowHeight to the target’s scrollWidth and scrollHeight to address viewport sizing or clipping:
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteconst canvas = await html2canvas(target, {
windowWidth: target.scrollWidth,
windowHeight: target.scrollHeight,
onclone: (clonedDocument) => {
const clonedTarget = clonedDocument.querySelector('.receipt-preview');
if (clonedTarget) clonedTarget.style.display = 'block';
}
});This sizing option does not reveal a hidden element by itself. It also cannot guarantee an arbitrarily large canvas: browser, operating system, and hardware limits vary.
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Check the styles the renderer can reproduce
The project’s online feature reference lists display, opacity, and visibility among supported CSS properties. Supported means html2canvas handles those properties; it does not mean the renderer overrides styles that hide content. The same reference lists limitations including filter, object-fit, box-shadow, mix-blend-mode, and zoom; transforms have limited support. Revealing an element therefore does not guarantee its appearance will exactly match a browser-native screenshot. The online feature reference does not identify a release or version, so check the behavior of the version installed in your project when investigating a version-specific issue.
Check images loaded from other origins
Changing visibility does not change browser origin rules. Images from the page’s own origin are the straightforward case. For images hosted elsewhere, html2canvas documents CORS- and proxy-related configuration; its FAQ notes that a proxy may be needed for images outside the page’s origin. Options such as useCORS, proxy, and allowTaint do not override browser security policy. Configure the image host to permit the required cross-origin access or use an appropriate proxy where necessary.
Troubleshooting hidden-element captures
| Symptom | Likely cause | What to check |
|---|---|---|
| The target is still missing. | The callback did not find the corresponding node, or a hidden ancestor still prevents rendering. | Confirm the selector exists in clonedDocument; inspect the target and its ancestors for hiding styles and reveal the necessary nodes in the clone. |
| The image is blank or clipped. | The target has unsuitable layout dimensions, extends beyond the capture viewport, or the canvas is too large for the environment. | Give the revealed element useful geometry. For viewport sizing, try windowWidth and windowHeight based on its scroll dimensions; remember canvas limits vary across environments. |
| The element appears, but its design differs. | Its appearance depends on CSS that html2canvas does not support fully, or the restored styles do not match the intended state. | Check the project’s supported-features reference and simplify or adjust styles in the clone. Consider native browser capture if exact rendered pixels are essential. |
| An image inside the target is absent or the exported canvas is tainted. | A cross-origin image lacks the required CORS access, or a proxy is needed. | Check the image server’s CORS configuration and html2canvas’s proxy/CORS options. These settings cannot bypass browser origin policy. |
| The target is unexpectedly omitted despite being visible. | It may match an exclusion rule. | Check whether ignoreElements or data-html2canvas-ignore applies to the target or one of its descendants; remove the exclusion if that content belongs in the output. |
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The Tool Desk
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import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90
)
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What html2canvas can and cannot promise
The clone hook solves a specific problem: changing the DOM state html2canvas renders without changing the live source document. It does not turn html2canvas into a native screenshot tool, guarantee exact visual fidelity, supply layout dimensions for every hidden design, or bypass cross-origin restrictions. If the output must match the browser’s rendered pixels precisely, evaluate a browser-native capture method in the environment where the capture will run.
Frequently Asked Questions
Does html2canvas support CSS visibility?
Its online feature reference lists visibility as supported, but that does not mean html2canvas will override a rule that hides an element.
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Yes, if you reveal the necessary hidden parent in the cloned document as well as the target; the result depends on the parent’s layout and styles.
Does onclone modify the page visitors see?
The documented callback modifies the cloned document used for rendering, not the original source document.
Quick Recap
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