[Webkit-unassigned] [Bug 157606] New: CSS transition-property doesn't accept "<custom-ident>"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157606

            Bug ID: 157606
           Summary: CSS transition-property doesn't accept
                    "<custom-ident>"
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 50167214 at qq.com

Such as WebKit doesn't support:

transition-property: foo;
transition-property: --foo; /* CSS variables */
transition-property: -webkit-foo;
transition-property: -foo-bar;
transition-property: 👻; /* Emoji */

transition: foo;
transition: --foo;
transition: -webkit-foo;
transition: -foo-bar;
transition: 👻; /* Emoji */


The most important is that some of the automatic generation of prefix tools(Autoprefixer) once generated WebKit does not support the attributes with the prefix, will lead to the entire transition property failure.

e.g.

transition: -webkit-mask-position, mask-position;

This should be a perfectly valid value,other browsers do not have such a problem.

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