[Webkit-unassigned] [Bug 249737] Setting outerHTML on child of DocumentFragment throws error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249737

Karl Dubost <karlcow at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |karlcow at apple.com
           See Also|                            |https://bugs.webkit.org/sho
                   |                            |w_bug.cgi?id=226808

--- Comment #1 from Karl Dubost <karlcow at apple.com> ---
Blink error:

> Uncaught DOMException: Failed to set the 'outerHTML' property on 'Element': This element's parent is of type '#document-fragment', which is not an element node.
>    at <anonymous>:1:31



WebKit error:
> nomodificationallowederror: Cannot set outerHTML on element because its parent is not an Element


Firefox returns:
''


https://searchfox.org/wubkat/rev/9ced63bbda6ac9231451b1ca549a16f397e28c78/Source/WebCore/dom/Element.cpp#3554-3589

```
ExceptionOr<void> Element::setOuterHTML(const String& html)
{
    // The specification allows setting outerHTML on an Element whose parent is a DocumentFragment and Gecko supports this.
    // However, as of June 2021, Blink matches our behavior and throws a NoModificationAllowedError for non-Element parents.
    RefPtr parent = parentElement();
    if (UNLIKELY(!parent)) {
        if (!parentNode())
            return Exception { NoModificationAllowedError, "Cannot set outerHTML on element because it doesn't have a parent"_s };
        return Exception { NoModificationAllowedError, "Cannot set outerHTML on element because its parent is not an Element"_s };
    }


// … cut for brevity

}

```

This was added by Chris Dumez in June 2021
https://bugs.webkit.org/show_bug.cgi?id=226808
https://github.com/WebKit/WebKit/commit/dc33e397532ef8140d9e3fa80b7723e16b863746

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