[Webkit-unassigned] [Bug 207516] New: Flash of white can occur if JS forces an early layout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207516

            Bug ID: 207516
           Summary: Flash of white can occur if JS forces an early layout
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nham at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 390306

  --> https://bugs.webkit.org/attachment.cgi?id=390306&action=review

repro case

In https://bugs.webkit.org/show_bug.cgi?id=134833, we added in a hack to force a layer flush on first layout on Mac (rather than waiting for first non-empty layout as we do for all other platforms). This can cause a flash of white if the first layout creates an empty render tree, e.g. if JS forces an empty layout early on in the page. We also see this flash-of-white issue in several real-world webpages on our PLT test suite, e.g. NYT and FB.

We should probably revert this change. This fixes the issue in our PLT content and in the attached repro case (which can be run by executing something like `php -S localhost:8081` and then navigating to http://localhost:8081).

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