[Webkit-unassigned] [Bug 249235] New: CSSToStyleMap::mapNinePieceImage doesn't take into account that the CSSBorderImageWidthValue may be omitted.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249235

            Bug ID: 249235
           Summary: CSSToStyleMap::mapNinePieceImage doesn't take into
                    account that the CSSBorderImageWidthValue may be
                    omitted.
           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

```
var s = document.body.style;
var cs = getComputedStyle(document.body);

s.webkitBoxReflect = "left 0px url() 3 / 4% / 5px";
cs.webkitBoxReflect; // "left 0px url(\"\") 3 fill / 4% / 5px stretch"

s.webkitBoxReflect = "left 0px url() 3 // 5px";
cs.webkitBoxReflect; // Actual: "left 0px url(\"\") 3 fill / auto / 0 stretch"
                     // Expected: "left 0px url(\"\") 3 fill / auto / 5px stretch"
```

-webkit-border-image and -webkit-mask-box-image had the same problem before they became shorthands in bug 237487 and bug 249115.

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