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