> I'm not sure if modern libraries try to work around this. I see. You mentioned elsewhere (e.g. [here](https://discourse.wicg.io/t/mouseevent-hitclientrect-as-alternative-to-non-interoperable-mouseevent-offsetx/4979)) that this is a common source of layout thrashing. If it isn't common libraries, is it that many sites apply workarounds? Would any of the common workarounds you've seen break if all browsers moved to the currently-specified behavior? If so, do those workarounds use UA sniffing to not do it in Firefox? -- GitHub Notification of comment by chrishtr Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5659#issuecomment-721296645 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Tuesday, 3 November 2020 18:17:31 UTC
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