[Webkit-unassigned] [Bug 252403] New: HTMLStyleElement mangles -webkit-mask-repeat into unsupported mask-repeat

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252403

            Bug ID: 252403
           Summary: HTMLStyleElement mangles -webkit-mask-repeat into
                    unsupported mask-repeat
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clshortfuse at gmail.com

When creating an HTMLStyleElement with `-webkit-mask-repeat` included, the property is mangled to `mask-repeat`. Webkit supports `-webkit-mask-repeat`, but not `mask-repeat`. Therefore, when attempting to reflect back into another HTMLStyleElement, the style is invalid. This is used to ponyfill/polyfill CSS Modules (native ones).

Test: https://codepen.io/shortfuse/pen/PodwrJE

Chrome PASS
Firefox PASS
WebKit/Safari FAIL

Unprefixing is fine if it's supported. Firefox unprefixes and that's fine. Chrome doesn't unprefix, so that's also fine. But Webkit will unprefix and break the ability to replicate styles. 

Related:

* https://bugs.webkit.org/show_bug.cgi?id=167255
* https://bugs.webkit.org/show_bug.cgi?id=227967
* https://bugs.webkit.org/show_bug.cgi?id=229082

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