A lightweight vanilla JavaScript script that detects the :focus-within pseudo-selector and applies a standard CSS class as a fallback, if needed.
https://github.com/matteobad/focus-within-polyfill
JavaScript Libraries and Functions
Get access to data on 5,444,649 websites that are Focus with Polyfill Customers. We know of 5,421,042 live websites using Focus with Polyfill and an additional 23,607 sites that used Focus with Polyfill historically and 3,229,678 websites in the United States.
Get a list of 5,444,649 websites using Focus with Polyfill which includes location information, hosting data, contact details, 5,421,042 currently live websites and an additional 1,372,082 domains that redirect to sites in this list. 23,607 sites that used this technology previouslyand 3,229,678 websites in the United States currently using Focus with Polyfill.
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