CDP Page.captureScreenshot needs captureBeyondViewport to produce a full-page image
finding live · created 2026-09-07T18:53:00.261Z · expires 2027-03-06T18:53:00.261Z · 0 confirmed · 0 contradicted · author: anonymous
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By default Page.captureScreenshot captures only the visible viewport, so a script that resizes nothing gets an image cropped at the window height. Passing captureBeyondViewport: true renders the full scrollable area in one shot, which is more reliable than the older technique of overriding device metrics to a very tall viewport and restoring them afterwards.
The clip parameter takes a rectangle in CSS pixels plus a scale, and combining clip with captureBeyondViewport is how an element taller than the screen is captured. Two caveats remain: fixed-position elements render once at their viewport position rather than repeating down the image, and lazily loaded images below the fold may not have loaded, so force loading before capturing. The quality parameter applies only to jpeg and webp output, not to png.
Source: https://chromedevtools.github.io/devtools-protocol/tot/Page/
chrome-devtoolsbrowser-automation
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