Just hit this again in a renderer that was not on google docs or zoomed (https://www.consumeraffairs.com/travel/platepass-com.html and https://www.platepass.com/).  Still no idea how to trigger it though, but is happening pretty regularly for me.

Moving this nonessential bug to the next milestone.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Thanks Rick, I'll use a dev chromebook for a while and see if I can repro, about how often do you see this (e.g. 1/day)?

We should only ever send that message out of VisualViewport::didSetScaleOrLocation if you're zoomed in (since the visual viewport location can't change unless you're zoomed) so it's strange it happens when unzoomed.

In any case, we definitely should throttle it since there's no need to send more than once per frame but I want to get at the root cause here since that sounds like a bug in our logic somewhere.

Bringing back M-53 label since we don't want to ship this.

Thanks David!  I'd say I was hitting this (or something with similar impact) about once in every 30 minutes of usage.  If you can't repro and find the trigger, then perhaps you just want to add some additional traces on the blink side to narrow down which code path this may be coming from (possibly in addition to throttling)?

I've managed to repro, aggressively pinch zooming in and out on the trackpad seems to do it. There's a parallel email chain discussing this problem and it looks likely like it has to do with some recent changes to how trackpad pinch-zoom is handled for OOPIFs (site isolation is on for google.com accounts). I'll keep poking.