[Webkit-unassigned] [Bug 245496] New: Percentage (%)-based heights for absolute-positioned children not respecting sticky parent height

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=245496

            Bug ID: 245496
           Summary: Percentage (%)-based heights for absolute-positioned
                    children not respecting sticky parent height
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: brandon at dreamthinkbuild.com

Created attachment 462510

  --> https://bugs.webkit.org/attachment.cgi?id=462510&action=review

safari

Interestingly, all three "major" browsers display this styling differently.

It looks like percentage (%)-based sizes for absolute-positioned children under sticky elements are sized according to the closest "relative" parent's height and ignore the sticky parent's height, whereas other browsers use the sticky element's height.

is this the spec, or a bug? Attaching screenshots for Safari, Chrome, and Firefox.

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