[Webkit-unassigned] [Bug 200230] New: Second call to setAttributeNS creates non-prefixed attribute

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200230

            Bug ID: 200230
           Summary: Second call to setAttributeNS creates non-prefixed
                    attribute
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ian at ianbellomy.com

Created attachment 375081

  --> https://bugs.webkit.org/attachment.cgi?id=375081&action=review

Example.

Calling setAttributeNS creates a prefixed attribute as expected.
A second call to setAttributeNS at a later time results in a new non-prefixed attribute. This is also the attribute accessed by getAttributeNS thereafter—the prefixed attribute appears to be inaccessible after the subsequent call. 
Subsequent calls to setAttributeNS modify the value of the non-prefixed attribute.

In Chrome and FF, repeat calls to setAttributeNS change the prefixed attribute's value.

I don't have the perspective to rate severity, but this behavior is _real_ unexpected on this end...

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