Scroll through the page to trigger viewport-based lazy loading, wait for the images and any page-specific content you need to become ready, then capture the full page. A full-page screenshot option covers the scrollable page; by itself, it does not guarantee that offscreen images have loaded.
Why a full-page screenshot can still miss images
Browsers commonly defer loading offscreen images until they approach the viewport. A screenshot tool can capture the whole scrollable page without ever bringing every image into view first. The result may include blank image areas or a layout that changes after capture.
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Playwright describes full-page capture as a screenshot of the full scrollable page, and Puppeteer offers a fullPage option. Neither capability, on its own, establishes that every lazy-loaded asset has finished loading. See Playwright’s screenshot documentation and Puppeteer’s ScreenshotOptions interface.
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This Node.js example scrolls down in viewport-sized steps, waits briefly at each step, checks ordinary image elements, and then captures the page. It uses Chromium through Playwright.
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- Install Playwright: run
npm install playwright, thennpx playwright install chromium. - Save the script: create
screenshot.jswith the code below. - Run it: use
node screenshot.js https://example.com, replacing the URL with the page you want to capture.
const { chromium } = require('playwright');
(async () => {
const url = process.argv[2];
if (!url) {
throw new Error('Usage: node screenshot.js https://example.com');
}
const browser = await chromium.launch({ headless: true });
const page = await browser.newPage({ viewport: { width: 1365, height: 900 } });
try {
await page.goto(url, { waitUntil: 'domcontentloaded', timeout: 60000 });
// Bring successive parts of the document into view to trigger lazy loading.
await page.evaluate(async () => {
const pause = ms => new Promise(resolve => setTimeout(resolve, ms));
const step = Math.max(window.innerHeight, 500);
let previousHeight = 0;
let stableHeightCount = 0;
while (stableHeightCount < 3) {
const height = document.documentElement.scrollHeight;
for (let y = 0; y < height; y += step) {
window.scrollTo(0, y);
await pause(250);
}
window.scrollTo(0, document.documentElement.scrollHeight);
await pause(500);
const newHeight = document.documentElement.scrollHeight;
if (newHeight === previousHeight) stableHeightCount++;
else stableHeightCount = 0;
previousHeight = newHeight;
}
// Check standard img elements; this does not cover CSS backgrounds
// or application-specific loading indicators.
await Promise.all(
Array.from(document.images, img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
setTimeout(resolve, 10000);
});
})
);
window.scrollTo(0, 0);
});
const imageStatus = await page.locator('img').evaluateAll(images =>
images.map(img => ({
src: img.currentSrc || img.src,
complete: img.complete,
loaded: img.naturalWidth > 0
}))
);
const failedImages = imageStatus.filter(img => !img.loaded);
if (failedImages.length) {
console.warn(`${failedImages.length} img element(s) did not load successfully.`);
}
await page.screenshot({ path: 'page.png', fullPage: true });
console.log('Saved page.png');
} finally {
await browser.close();
}
})();The script considers the page height stable after three passes without a height change. That is a practical stopping rule, not proof that a page is finished: pages that append content slowly or only after a particular interaction may need a site-specific condition or a defined capture boundary.
Make readiness checks match the page
For ordinary <img> elements, img.complete indicates that loading has finished, while img.naturalWidth > 0 helps distinguish a loaded image from one that failed. The script logs failures rather than silently treating every completed request as a successful image.
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- CSS background images: they are not included in
document.images. If they matter, check the relevant elements and page state separately. - Custom image components: a component may expose its own loading indicator or completion state. Wait for that signal where possible.
- Infinite scroll: scrolling can keep creating new content. Decide how many items or how much page height to capture, and stop at that boundary.
- Virtualized lists: some pages remove offscreen items from the document. A full-page screenshot cannot include items that are not present; capture the needed sections separately or use the application’s export method.
- Interaction-gated content: scrolling will not reveal content that requires a click, consent choice, or other action. Perform the necessary interaction before checking readiness.
Capture with Puppeteer instead
If Puppeteer is already part of your project, use its page screenshot method with fullPage: true after the same scroll-and-readiness workflow. Puppeteer’s screenshot guide demonstrates navigation with waitUntil: 'networkidle2', but that example is not a guarantee that every site’s lazy images or application state are ready. See Puppeteer’s screenshot guide.
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(async () => {
const browser = await puppeteer.launch({ headless: true });
const page = await browser.newPage({ viewport: { width: 1365, height: 900 } });
try {
await page.goto('https://example.com', {
waitUntil: 'domcontentloaded',
timeout: 60000
});
await page.evaluate(async () => {
const pause = ms => new Promise(resolve => setTimeout(resolve, ms));
const step = Math.max(window.innerHeight, 500);
const height = document.documentElement.scrollHeight;
for (let y = 0; y < height; y += step) {
window.scrollTo(0, y);
await pause(250);
}
window.scrollTo(0, document.documentElement.scrollHeight);
await pause(500);
await Promise.all(Array.from(document.images, img => {
if (img.complete) return Promise.resolve();
return new Promise(resolve => {
img.addEventListener('load', resolve, { once: true });
img.addEventListener('error', resolve, { once: true });
setTimeout(resolve, 10000);
});
}));
window.scrollTo(0, 0);
});
await page.screenshot({ path: 'page.png', fullPage: true });
} finally {
await browser.close();
}
})();Puppeteer documents Page.screenshot() for capturing screenshots and supports element screenshots as well as full-page capture. If only one component matters, capturing that element can be more useful than rendering an entire long page.
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When to use a fixed wait, network idle, or visual stability
- Fixed delay: simple but fragile. A short delay may miss slow assets; a long one wastes time. Use it as a settling interval after scrolling, not as the only readiness test.
- Network idle: can be a useful navigation condition, and Puppeteer shows
networkidle2in an example. It does not establish that every offscreen lazy image has been requested, nor that all application rendering is complete. - Image completion: checking relevant image elements is more direct for standard images, but does not cover CSS backgrounds, failed requests, or app-specific state.
- Visual stability assertions: Playwright’s screenshot assertions wait for consecutive screenshots to be visually stable before comparing the latest result. They are available through the Playwright test runner and are for visual comparison; stability does not prove every offscreen asset has been requested. See Playwright PageAssertions.
Troubleshooting missing or incomplete images
Some images are blank
Confirm that the script scrolled far enough to bring the relevant area into view. Check the logged image status: complete can be true even when an image failed, so inspect naturalWidth as well. For CSS backgrounds or custom components, add a page-specific readiness check.
The screenshot stops before the page content ends
Inspect whether the site adds content only after scrolling. The example repeats scroll passes as the document height changes; for slow-loading infinite feeds, define a maximum height, item count, or other stopping condition rather than waiting indefinitely.
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Layout shifts after the screenshot
Images can change page geometry when they load. Wait for the relevant images and any known page loading indicator, then capture. If content appears only after a later interaction, reproduce that interaction before taking the screenshot.
Navigation times out or never becomes idle
Pages with continuing network activity may not reach a network-idle condition. Use an appropriate navigation milestone such as domcontentloaded, then wait for the specific images or application state you need. Increase the navigation timeout only when the page genuinely needs more time; a larger timeout alone does not make missing content load.
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