This feels like such a smoke and mirrors thing. This gem: Write compatible code Browsers offer many APIs and JavaScript is a quickly-evolving language. Google

This feels like such a smoke and mirrors thing. This gem: Write compatible code Browsers offer many APIs and JavaScript is a quickly-evolving language. Googlebot has some limitations regarding which APIs and JavaScript features it supports. To make sure your code is compatible with Googlebot, follow our guidelines for troubleshooting JavaScript problems. Leads to this page: https://developers.google.com/search/docs/guides/fix-search-javascript https://developers.google.com/search/docs/guides/fix-search-... Which says absolutely nothing. It details nothing about what is supported. Utterly useless. No version of HTML running, no info about what gets run, no actual technical details at all.