[Webkit-unassigned] [Bug 147193] New: Implement an internal API to paint DOM elements onto a canvas for testing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147193

            Bug ID: 147193
           Summary: Implement an internal API to paint DOM elements onto a
                    canvas for testing
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: wenson_hsieh at apple.com

While working on https://bugs.webkit.org/show_bug.cgi?id=147192, I realized that there's no easy way to test the fact that search fields should be empty (no placeholder text) by default besides using pixel tests, which are not particularly useful. This could be addressed via an internal API that renders DOM elements  or part of the DOM onto a canvas element in the DOM, so that we can run tests regarding the look of elements in Javascript, without using pixel tests.

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