page.screenshot({ fullPage: true }) captures the page’s full scrollable height, but it does not necessarily scroll through the page to trigger lazy-loaded images. Scroll through the content in steps, wait for the relevant images to finish loading successfully, then capture. For pages that add more content as you scroll, continue until an application-specific condition—or a bounded stop condition—is reached.
Why a full-page screenshot can still miss images
Full-page capture controls how much of the document is included in the screenshot; it is not a guarantee that every deferred resource has loaded. Native lazy loading postpones offscreen image requests until the browser estimates they are close to being needed. The document’s load event can fire while such images remain unloaded. MDN’s lazy-loading guidance explains this browser behavior.
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Scrolling gradually brings content into or near the viewport and can trigger native lazy loading, intersection observers, and scroll-based application code. Afterward, check image readiness rather than assuming a delay or the page-load event means the images succeeded.
Use gradual scrolling, then verify image success
This Playwright JavaScript helper scrolls in steps, allows scroll-triggered code a brief opportunity to run, waits for the image elements present at the end to settle, checks for broken images, returns to the top, and takes a full-page screenshot.
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async function loadImagesBeforeScreenshot(page) {
await page.evaluate(async () => {
const pause = ms => new Promise(resolve => setTimeout(resolve, ms));
const step = Math.max(200, Math.floor(window.innerHeight * 0.8));
let previousHeight = 0;
let stableRounds = 0;
// Keep scrolling while height grows; cap the loop for safety.
for (let i = 0; i < 80 && stableRounds < 3; i++) {
window.scrollBy(0, step);
await pause(150);
const height = document.documentElement.scrollHeight;
stableRounds = height === previousHeight ? stableRounds + 1 : 0;
previousHeight = height;
}
window.scrollTo(0, 0);
});
const failures = await page.evaluate(async () => {
const images = [...document.images];
await Promise.all(images.map(img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
});
}));
return images
.filter(img => img.currentSrc && img.naturalWidth === 0)
.map(img => img.currentSrc);
});
if (failures.length) {
throw new Error(`Images failed to load: ${failures.join(', ')}`);
}
await page.screenshot({ path: 'page.png', fullPage: true });
}Call the helper after navigating to the page and before taking the screenshot. The 150 ms pause is a small opportunity for scroll-triggered application code to run; it is not used as proof that images loaded. Image completion and the naturalWidth check provide that signal. If the application exposes a more meaningful readiness signal, such as a known item count or a loading indicator disappearing, wait for that instead.
What the checks mean
img.completeindicates that loading has finished, including when an image failed. It does not prove the image is usable.img.naturalWidth > 0is a useful success check for an image that should contain image data. A zero width identifies a failed or unusable image in this check.document.imagescovers HTML image elements, not CSS background images. If the page uses background images, inspect the relevant elements and wait for their resources using an application-specific check.
The helper is a starting point, not a universal lazy-loading utility supplied by Playwright. Its bounded loop stops after 80 scrolls or three rounds without a change in document height. A fixed-height page may use a simpler loop bounded by its known height. For an infinite-scroll page, a known item count, an application-ready signal, or a loading indicator is more reliable than relying only on height.
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Adapt the method to the page’s loading behavior
Finite page with ordinary lazy images
Use incremental scrolling through the page, then wait for the images that matter and verify successful loading. Returning to the intended capture position before the screenshot avoids leaving the page scrolled if you are taking a viewport-only capture; for a full-page capture, the helper returns to the top as well.
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Scrolling may append items, change the page height, or replace existing DOM nodes. Prefer waiting after each scroll for the site’s actual signal—for example, a target item count or a spinner to disappear—then continue until the desired content is present. The sample gathers image elements present at the end, so adapt it if the application replaces earlier nodes or if images must be checked as each batch appears.
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Nested scrolling container or application action
If the content sits inside a nested scrollable element, scrolling window will not bring it into view. Identify and scroll that container instead. Some sites load content only after a particular click or other user action; reproduce that action rather than assuming window scrolling will trigger it.
Full-page versus viewport capture
Use fullPage: true when the desired output is the entire scrollable document. Omit it when you want only the current viewport. In either case, make the required content ready before capture: choosing the full-page extent does not itself trigger deferred content loading. See the Playwright Page API for screenshot options.
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Why common waiting approaches fail
- Only setting
fullPage: true: this requests a full-height screenshot; it does not make the page’s deferred images load. - Waiting for navigation or
load: lazy images may still be outstanding when the load event fires. - Waiting for
networkidle: Playwright discourages using this as a general readiness test. Polling or persistent connections can also make network quietness a poor proxy for whether the required content is ready. Wait for a meaningful element, image, or application signal instead. - Using only a fixed timeout: elapsed time does not prove a particular image loaded, and fixed waits can make tests flaky. Use a short delay only when needed to let scroll-triggered code run; assert the relevant condition separately.
- Checking only
complete: a broken image can be complete. ChecknaturalWidthwhen successful image data matters. - Scrolling only the main window: the relevant content may be in a nested scroller, loaded by an application action, or represented as a CSS background.
For visual regression, Playwright’s screenshot assertions wait for consecutive screenshots to match before comparison. That can help stabilize a visual baseline, but it does not trigger images or other content the page has not loaded.
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- Confirm what is missing. Check whether the image is an
<img>, a CSS background, or content inserted only after an action. Confirm that the element exists in the DOM. - Identify the actual trigger. Determine whether loading depends on viewport proximity, a scroll event, a nested scroll container, or an application action.
- Scroll in the relevant place. Move through the content gradually so intermediate viewport-sensitive triggers have a chance to run.
- Wait for a specific completion signal. For image elements, check completion and successful dimensions; for dynamically added content, use an item count, spinner state, or app readiness condition.
- Restore the capture position and take the screenshot. Use
fullPage: trueonly when you want the whole document. - Stabilize the environment for visual comparisons. Keep browser engine, viewport, device scale, and test host aligned with the environment used for the visual baseline.
Or skip the browser setup
ScreenshotNeo is a screenshot API and MCP server for developers. Its full-page capture loads lazy images. One GET request can return an image or PDF; see the API documentation.
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Frequently Asked Questions
Why does img.complete return true for a missing image?
It also becomes true after a failed load. Check naturalWidth as well when you need to confirm usable image data.
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