NEW 212373
ResizeObserver doesn't trigger for elements with size in viewport values on window zoom 
https://bugs.webkit.org/show_bug.cgi?id=212373
Summary ResizeObserver doesn't trigger for elements with size in viewport values on w...
Golubov Nikita
Reported 2020-05-26 06:55:57 PDT
1. Make a div with width in vw and height in vh 2. Create ResizeObserver and observe this div 3. Zoom browser window Showcase: https://jsfiddle.net/yLdvctzx/14/show Code: https://jsfiddle.net/yLdvctzx/14 Expected behavior: ResizeObserver should detect resizing of the div and trigger its handler because elements's size in pixels has changed after zoom. Actual behavior: ResizeObserver doesn't trigger handler. In the showcase example you can see that dimensions doesn't update on widnow resize. Video demonstration: https://monosnap.com/file/WbacIuL2djfoCDiUE8Q5weaH1j1HEL Chromium has the same issue (https://bugs.chromium.org/p/chromium/issues/detail?id=1086465). Works if FireFox.
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Radar WebKit Bug Importer
Comment 1 2020-05-26 18:16:49 PDT
<rdar://problem/63653855>
Simon Fraser (smfr)
Comment 2 2022-10-03 12:12:21 PDT
Does this reproduce in a recent Safari Tech Preview? There have been some fixes in this area.
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