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Evolving the CLS metric we've finalized the change we plan to make to the metric: maximum session window with 1 second gap, capped at 5 seconds.


The lighthouse CLS score is calculated based on the current viewport it is being tested in. For example, if you test your site on a 1366px monitor and then on a 1920px monitor, the scores may be different (depending on your code quality). So if you're seeing a bad CLS score from the collaborative data on the Page Speed Insights tool, or in the Google search ...


If you're using JavaScript that binds to HTML elements, then the HTML has to load first.

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