[Webkit-unassigned] [Bug 237175] New: [css] text-decoration is not implemented as a shorthand of its longhands

Thu Feb 24 19:39:03 PST 2022

https://bugs.webkit.org/show_bug.cgi?id=237175

            Bug ID: 237175
           Summary: [css] text-decoration is not implemented as a
                    shorthand of its longhands
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: obrufau at igalia.com
            Blocks: 236272

<!DOCTYPE html>
    <div>I should have underline</div>
    <script>
    var element = document.querySelector("div");
    element.style.all = "initial";
    element.style.textDecoration = "underline";
    </script>

The element should be underlined, but it's not!

The cause is that 'text-decoration' is not a shorthand of 'text-decoration-color', 'text-decoration-line', etc.
So when the 'all' shorthand expands, the longhands appear later.
When setting 'text-decoration: underline', it's just updated in place.
The longhands still have precedence appearing later, and they are still set to 'initial'.

Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=236272
[Bug 236272] [css] Can't revert low-priority properties like text-decoration
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