[Webkit-unassigned] [Bug 231054] New: Implement CSSStyleSheet Replace() Functionality

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231054

            Bug ID: 231054
           Summary: Implement CSSStyleSheet Replace() Functionality
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: karl+webkit at la-grange.net

> The replaceSync() method of the CSSStyleSheet interface synchronously replaces the content of the stylesheet with the content passed into it.
See https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/replaceSync
And https://drafts.csswg.org/cssom/#dom-cssstylesheet-replacesync

The method is implemented in both Blink and Gecko.
On Firefox, the feature is not yet enabled on Nightly but available behind a flag.
https://bugzilla.mozilla.org/show_bug.cgi?id=1613746
https://bugzilla.mozilla.org/show_bug.cgi?id=1644101


This creates a webcompat issue on https://boxy-svg.com/app
which has a feature detection mechanism depending on 

```
    window.CSSStyleSheet.prototype.replaceSync   !== undefined &&
```

 https://webcompat.com/issues/88587

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