![]() ![]() Unexpected movement of page content usually happens because resources are loadedĪsynchronously or DOM elements get dynamically added to the page above existingĬontent. Most of the time these kinds of experiences are just annoying, but in someĪ screencast illustrating how layout instability can negatively affect Worse: you're about to tap a link or a button, but in the instant before yourįinger lands-BOOM-the link moves, and you end up clicking something The page? Without warning, the text moves, and you've lost your place. Have you ever been reading an article online when something suddenly changes on 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. Source Key term: Cumulative Layout Shift (CLS) is a stable Core Web Vital metric.
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