[Webkit-unassigned] [Bug 275621] New: Computed style in SVG should not be affected by CSS zoom

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275621

            Bug ID: 275621
           Summary: Computed style in SVG should not be affected by CSS
                    zoom
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pdr at google.com
                CC: sabouhallawa at apple.com, zimmermann at kde.org

Created attachment 471700

  --> https://bugs.webkit.org/attachment.cgi?id=471700&action=review

Testcase showing computed style of zoomed values in html and svg

CSS zoom has recently been standardized (https://github.com/w3c/csswg-drafts/issues/5623) and Gecko has begun shipping this. A property of CSS zoom is that computed styles should not reflect the zoomed value. One reason for this is to support round-tripping. This is generally supported across Chromium, Gecko, and Webkit. In SVG though, Webkit incorrectly unzooms computed styles (see attached testcase).

Expected (Chromium, Gecko):
  svg width computed style: 100px
  rect width computed style: 50px
  div width computed style: 100px

Actual (Safari 17.4 WebKit 19619.1.16.3):
  svg width computed style: 100px
  rect width computed style: 25px
  div width computed style: 100px

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