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Use page.render() only after the animation has had time to advance. For an approximate frame, wait with a timer after page.open() reports success. For repeatable screenshots, run page.evaluate() in the page context to put the animation or target element into a known state, then render. PhantomJS does not provide an animation-frame selector, and its project says development is suspended, so verify behavior on the exact PhantomJS/QtWebKit build you deploy.
What PhantomJS can—and cannot—capture
PhantomJS captures the page as it exists when page.render() executes. The normal load callback tells you that navigation completed; it does not mean a CSS animation has reached a particular keyframe. A delay therefore chooses an elapsed time, not a guaranteed frame.
The official documentation describes PhantomJS as a headless WebKit browser and notes that development is suspended until further notice (official PhantomJS homepage). CSS animation support can differ between builds. Do not assume that every modern animation property, timing function, or vendor prefix behaves identically in your runtime.
Choose a capture strategy
Approximate timing with a delay
Use a timer when “roughly one second after load” is good enough. It is simple, but the result can move between runs if fonts, images, network requests, JavaScript startup, or animation start time vary.
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Set a known state before rendering
For regression images or documentation, use page.evaluate() to change styles or classes in the page itself, pause an animation, or set an explicit progress state. This is more repeatable than sleeping, but the code must match the page’s implementation and the behavior supported by your WebKit build.
Capture only the relevant region
Set viewportSize before navigation for a controlled layout. Set clipRect when the screenshot should contain only the animated component. The screen-capture guide documents both controls and the supported PNG, JPEG, GIF, and PDF outputs (Screen Capture with PhantomJS).
Minimal delayed screenshot
This complete script waits one second after a successful load, renders a PNG, and exits. The delay is an example starting point, not a universal value; tune it for the page you are capturing.
var page = require('webpage').create();
page.viewportSize = { width: 1024, height: 768 };
page.open('https://example.com/', function (status) {
if (status !== 'success') {
console.log('Unable to load page');
phantom.exit(1);
return;
}
// Approximate capture point; tune for the target animation.
setTimeout(function () {
page.render('capture.png');
phantom.exit();
}, 1000);
});Run it with the PhantomJS executable, for example phantomjs capture.js. The quick-start documentation demonstrates the same load-then-render pattern and explains why phantom.exit() is needed to terminate the script (Quick Start).
Capture a selected animation state
A page-context function can alter the DOM or inline styles before the screenshot. The following example pauses an element and sets its animation delay to a chosen negative offset. Whether this produces the intended visual state depends on the page’s CSS and the PhantomJS build, so inspect the output rather than assuming modern browser behavior.
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var page = require('webpage').create();
page.viewportSize = { width: 1024, height: 768 };
page.open('https://example.com/animated-page', function (status) {
if (status !== 'success') {
console.log('Unable to load page');
phantom.exit(1);
return;
}
var changed = page.evaluate(function () {
var element = document.querySelector('.hero-animation');
if (!element) {
return { ok: false, reason: 'Target element not found' };
}
// These declarations are page-specific. Adjust the property names and
// values to the animation used by the target site.
element.style.webkitAnimationPlayState = 'paused';
element.style.animationPlayState = 'paused';
element.style.webkitAnimationDelay = '-1s';
element.style.animationDelay = '-1s';
return { ok: true };
});
if (!changed.ok) {
console.log(changed.reason);
phantom.exit(1);
return;
}
page.render('animation-state.png');
phantom.exit();
});page.evaluate() executes in the web page context. Values crossing the boundary must be simple JSON-serializable data; closures, DOM nodes, and other complex objects cannot be returned directly. See the evaluate API documentation. Return a small status object, as above, rather than the element itself.
How to make repeated captures more consistent
Wait for prerequisites, not just a clock
A successful page.open() callback is a useful starting point, but external fonts, images, application data, and delayed JavaScript can still be loading. If the animation starts only after an application event, wait for a page-specific marker or use a conservative delay after that marker. PhantomJS’s page automation documentation lists callbacks such as onLoadFinished and onRepaintRequested, but neither callback selects a CSS animation frame (Page Automation).
Freeze the page before rendering
When possible, add a capture-only class or inline declarations that pause motion and select a known state. If the site exposes a progress class, set that class instead of guessing at elapsed milliseconds. Remove transitions from unrelated elements so a blinking cursor, carousel, or hover effect does not alter the image.
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Control layout inputs
- Set
viewportSizebeforepage.open(). - Use the same URL, query parameters, cookies, and user agent on every run.
- Set
clipRectonly after confirming the element’s position at the chosen viewport. - Use a stable output format and render quality settings documented by the render API.
Check the actual output
Run several captures on the exact machine and PhantomJS binary. Compare pixels or inspect the animation region manually. If the image changes despite a controlled state, the cause may be an unsupported CSS feature, asynchronous application code, font substitution, or a resource that has not finished loading.
Full-page and clipped captures
For a viewport screenshot, omit clipRect. For a component, assign a rectangle in page coordinates:
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page.clipRect = { top: 120, left: 80, width: 640, height: 360 };
page.render('component.png');The rectangle is not a CSS selector; it is a coordinate region. If responsive layout changes the component’s position, calculate the rectangle in page.evaluate() and return only numeric coordinates, then assign it in PhantomJS. Keep the returned object JSON-serializable.
Troubleshooting PhantomJS animation screenshots
The screenshot is taken before the animation moves
Cause: rendering occurs immediately after load, or the animation starts after another script runs. Fix: add a measured delay after the real start event, or set the animation state in page.evaluate() before page.render().
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Cause: elapsed-time capture is sensitive to resource and JavaScript timing. Fix: pause the target, set a page-specific state, disable unrelated motion, and keep viewport and inputs identical. A timer alone cannot guarantee determinism.
The animation does not respond to the style change
Cause: the selector is wrong, the site uses a class or script to control state, or the legacy WebKit build does not implement the property as expected. Fix: return a “target not found” status, test the exact property in that build, and use the site’s own state class or DOM controls where available.
page.evaluate() returns an error or unusable value
Cause: the function tries to return a DOM node, closure, or another non-serializable value. Fix: return strings, numbers, booleans, arrays, or plain objects containing those types; perform DOM work inside the evaluated function.
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The page loads but the target is blank
Cause: a failed request, delayed data, blocked resource, or an animation dependent on unsupported browser behavior. Fix: log page errors and network failures in your script, wait for an application-ready marker, and verify the URL in the same PhantomJS build. If the required behavior cannot be made reliable, move the capture to a maintained browser automation runtime that supports the page’s CSS and JavaScript.
The script never exits
Cause: the timer or callback path does not call phantom.exit(). Fix: call it after both successful and failure paths, and only after rendering has completed.
Performance, reliability, and output choices
- Delay cost: every extra wait increases wall-clock time. Measure the target page’s asset and animation startup, then use the shortest delay that is reliable for your build.
- Repeatability: explicit page state is generally more stable than a timestamp, but it is coupled to the page’s CSS and JavaScript.
- Viewport versus clip: a smaller clip reduces the image area and makes comparisons easier; it does not fix an unstable animation.
- Format: PNG is suitable for pixel comparisons; JPEG trades fidelity for smaller files. The render API documents format and quality options.
- Maintenance risk: PhantomJS is suspended software. Pin the binary, record its version and operating environment, and re-check captures after page or dependency changes.
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import requests
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open("shot.webp", "wb").write(r.content)Node.js
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Frequently asked questions
Can PhantomJS export an animated GIF of the CSS animation?
The screen-capture guide lists GIF as an output format, but a single page.render() call captures one page state; it is not documented as a multi-frame animation recorder. Capture separate states and assemble them with a tool that supports GIF creation if you need a sequence.
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Does onRepaintRequested provide the exact animation frame?
No. It is a repaint notification, not a frame-selection API. Use it for page automation signals only, and control the state explicitly when repeatability matters.
What if the site requires modern browser APIs?
PhantomJS uses legacy WebKit and its development is suspended. If the page depends on APIs or CSS behavior your build lacks, a maintained browser automation runtime is the practical fallback.
Can I use the same PhantomJS script for every animated site?
No. Selectors, animation implementation, loading triggers, and supported CSS differ by page and build. Treat the timer and state-setting code as page-specific capture logic.
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Frequently Asked Questions
Is a one-second delay a reliable standard for CSS animations?
No. It is only an example starting point; tune the delay to the target page and runtime, or set a known state with page-context code.
Why does a successful page.open callback not identify an animation frame?
It reports navigation completion. It does not wait for fonts, application data, or a particular point in a CSS animation.
Where are PhantomJS’s documented viewport and clipping controls?
The screen-capture guide documents viewportSize and clipRect; use viewportSize before navigation and clipRect for a coordinate-based region.
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