![]() What makes this issue even more problematic is that how a site functions in development is often quite different from how users experience it. The culprit might be an image or video with unknown dimensions, a font that renders larger or smaller than its fallback, or a third-party ad or widget that dynamically resizes itself. Unexpected movement of page content usually happens because resources are loaded asynchronously or DOM elements get dynamically added to the page above existing content. A screencast illustrating how layout instability can negatively affect users. Most of the time these kinds of experiences are just annoying, but in some cases, they can cause real damage. Or even worse: you're about to tap a link or a button, but in the instant before your finger lands-BOOM-the link moves, and you end up clicking something else! Have you ever been reading an article online when something suddenly changes on the page? Without warning, the text moves, and you've lost your place. ![]() It is an important, user-centric metric for measuring visual stability because it helps quantify how often users experience unexpected layout shifts-a low CLS helps ensure that the page is delightful. ![]() ![]() Cumulative Layout Shift (CLS) is a stable Core Web Vital metric. ![]()
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