[Webkit-unassigned] [Bug 247810] New: border shorthand serialization doesn't round-trip

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247810

            Bug ID: 247810
           Summary: border shorthand serialization doesn't round-trip
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: emilio at crisal.io
                CC: ntim at apple.com, obrufau at igalia.com,
                    simon.fraser at apple.com

document.body.style.border = "1px solid";
document.body.style.borderImageSlice = "99%"; // Something non-initial
document.body.style.border // Should be "", on WebKit is "1px solid"

Per spec it should be the empty string.

https://drafts.csswg.org/cssom/#serialize-a-css-value:

> If there is no such shorthand or shorthand cannot exactly represent the values of all the properties in list, return the empty string.

The list comes from https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-getpropertyvalue which has:

> For each longhand property longhand that property maps to, in canonical order [...]

And border maps to the border-image properties.

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