[Webkit-unassigned] [Bug 180733] New: Specific CSS styles thrashing the CPU

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180733

            Bug ID: 180733
           Summary: Specific CSS styles thrashing the CPU
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: malendariel at gmail.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Reduced test case here:

https://codepen.io/seancurtis/pen/ypLwwq

Changing the calc to calc(100vh - 20px) solves it, as does removing things like the transition or position. Might be revealing something more critical though.

Does not happen on 10.x. Still happens on tech preview (11.1 at the time of raising this).

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