[Webkit-unassigned] [Bug 132325] New: [CSS Blending] Add tests using blending and isolation for body and html elements.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=132325

           Summary: [CSS Blending] Add tests using blending and isolation
                    for body and html elements.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rosca at adobe.com
                CC: WebkitBugTracker at adobe.com


Add tests using blending and isolation for body and html elements. Some scenarios:
* Child of body should blend with body content, with body's background and, if any, html's background, otherwise, with the white opaque viewport.
* If body creates a stacking context, then a child of body should blend with content of body, excluding body's background.
* Setting mix-blend-mode on body, all the body contents, excluding background should blend with body's background and (if any) html background. There is a bug: https://bugs.webkit.org/show_bug.cgi?id=75460, saying that body's background will be truncated in this case.
* Set mix-blend-mode on html element -> everything should blend with opaque white.
* Setting isolation on html should not change anything.
* Setting isolation on body should create a stacking context.

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