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 5,340,857 websites that are Focus with Polyfill Customers. We know of 5,325,550 live websites using Focus with Polyfill and an additional 15,307 sites that used Focus with Polyfill historically and 3,198,384 websites in the United States.
Get a list of 5,340,857 websites using Focus with Polyfill which includes location information, hosting data, contact details, 5,325,550 currently live websites and an additional 1,321,498 domains that redirect to sites in this list. 15,307 sites that used this technology previouslyand 3,198,384 websites in the United States currently using Focus with Polyfill.
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