[Webkit-unassigned] [Bug 275842] New: SVG's path "d" property always returning "none" as getComputedStyle

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275842

            Bug ID: 275842
           Summary: SVG's path "d" property always returning "none" as
                    getComputedStyle
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
               URL: https://codepen.io/igrecesc/pen/yLWKxPd?editors=1010
                OS: Unspecified
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: igrecesc at adobe.com
                CC: darin at apple.com, graouts at webkit.org, koivisto at iki.fi

This is Safari as shipped in iOS Beta 18 - AppleWebKit/605.1.15

The "d" property for the SVG path element was previously not implemented in CSS / getComputedStyle.
It is now half implemented and this is a serious problem - since it is now returning always "none"

Reproducing:
For example, this page https://codepen.io/igrecesc/pen/yLWKxPd?editors=1010 used to display just "Computed style for d:" on Safari. In other browsers it might display `Computed style for d: path("M 0 0 L 100 0 L 100 100 L 0 100 Z")` which is the CSS equivalent of the attribute.

Outcome:
In Safari shipped with iOS 18 beta this always displays `Computed style for d: none` regardless of the path attribute value.

Expected: undefined as before or path("... as a fix forward

Impact:
This prevents our SVG workflows from making a meaningful choice (before, it was easier to reason about an unimplemented feature). We cannot assume that "none" should be falling back to reading the attribute since one path attribute could be present and a CSS style could legitimately override that to be none.

Links:
The start of the implementation https://commits.webkit.org/277297@main as tracked here https://bugs.webkit.org/show_bug.cgi?id=272446

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