[Webkit-unassigned] [Bug 244427] New: Container query is breaking WAAPI

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244427

            Bug ID: 244427
           Summary: Container query is breaking WAAPI
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mic.gallego at gmail.com
                CC: dino at apple.com, graouts at apple.com

Hi,

While testing Safari TP, I found that some of our code completely broke (at least since TP152). I created a minimal test case here: https://codesandbox.io/s/serene-aj-gll158?file=/src/index.js:164-165

After clicking the button, the "Should show" test should be in red. On Chrome with container query enabled this works correctly, on Safari the content is completely hidden after the animation.

Thanks!

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