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 5,160,572 websites that are Focus with Polyfill Customers. We know of 5,150,969 live websites using Focus with Polyfill and an additional 9,603 sites that used Focus with Polyfill historically and 3,102,169 websites in the United States.
Get a list of 5,160,572 websites using Focus with Polyfill which includes location information, hosting data, contact details, 5,150,969 currently live websites and an additional 1,312,481 domains that redirect to sites in this list. 9,603 sites that used this technology previouslyand 3,102,169 websites in the United States currently using Focus with Polyfill.
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