Cumulative Layout Shift in Practice
Table of Contents Introduction What is Cumulative Layout Shift? Why is it important? Definition When Does it End? Single Page Apps (SPAs) IFRAMEs How to Improve It How to Measure It RUM Example Code Attribution Fallbacks Browser Support Gotchas Open-Source / Free RUM Commercial RUM Synthetic Free Synthetic Developer Tools Commercial Synthetic Monitoring Tools RUM vs. Synthetic Real World Data What
Cumulative Layout Shift (CLS)  | Articles  | web.dev
Unexpected layout shifts can disrupt the user experience in many ways, from causing them to lose their place while reading if the text moves suddenly, to making them click the wrong link or button. In some cases, this can do serious damage. A sudden shift in layout makes the user confirm a large order they intended to cancel. Unexpected movement of page content usually happens when resources load
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