Deprecated APIs are scheduled to be removed from Chrome. Calling these APIs after they're removed causes errors on your site. Lighthouse flags the deprecated APIs:
How this audit fails
Lighthouse collects the deprecated API warnings that Chrome logs to the DevTools Console and includes them in the Lighthouse repot as warnings.
Each Best Practices audit is weighted equally in the Lighthouse Best Practices Score. Learn more in The Best Practices score.
How to remove deprecated APIs.
Go to Chrome Platform Status and expand the entries for the APIs that you're using to learn more about why the APIs are deprecated, as well as how to replace them.
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