gp Some sites that are "Chrome-only" seem to rely on look-behind functionality in regex, which is not supported in Safari or Webkit. It is widely supported in pretty much every other browser. It's part of ES2018, so strange it's not supported yet in Webkit or Safari (which are now outliers) https://stackoverflow.com/questions/51568821/works-in-chrome-but-breaks-in-safari-invalid-regular-expression-invalid-group Example and info on caniuse - https://caniuse.com/js-regexp-lookbehind with some references to details of how it works etc, and the spec. A site that requires this (as an example) - https://athensresearch.github.io/athens/ (spoof user agent as Chrome to see the issue).
Vlad gp Give our resources and current workload, isn't this best left to WebKit team (pretty sure there is an issue there that can be upvoted?)
Cannabat Here's the 4.5-year-old webkit bugzilla report for this: https://bugs.webkit.org/show_bug.cgi?id=174931 The assignee said they hoped to get to it in the next few months as of September 2021, so hopefully this will be implemented soon.