[Webkit-unassigned] [Bug 164164] New: CSS filters do not apply to body background

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164164

            Bug ID: 164164
           Summary: CSS filters do not apply to body background
    Classification: Unclassified
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit-bugzilla at alanhogan.com

Created attachment 293246
  --> https://bugs.webkit.org/attachment.cgi?id=293246&action=review
GIF showing filter enabling and disabling. Text changes, bg does not

EXPECTED: `body { filter: grayscale(100%); background: green; }` will show a gray background on a web page.
ACTUAL: Background remains green.

This is preventing successful run of my grayscale bookmarklet (https://alanhogan.com/bookmarklets#grayscale) from running successfully.

JSFiddle: https://jsfiddle.net/alanhogan/ykjLf5yr/

Blink bug: https://bugs.chromium.org/p/chromium/issues/detail?id=591015

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