[Webkit-unassigned] [Bug 159555] New: adoptNode() changes css class to lowercase for document loaded with XHR responseType = "document"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159555

            Bug ID: 159555
           Summary: adoptNode() changes css class to lowercase for
                    document loaded with XHR responseType = "document"
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: theblueslate at gmail.com
                CC: cdumez at apple.com

For a full demonstration, see https://jsfiddle.net/theblueslate/wxo7zst5/2/

I use XHR with responseType = "document" to load html fragments dynamically. To include them in the document, I use adoptNode(). However, if the XHR parsed document is from a document in quirks mode, and the contents contains a css class that includes an uppercase letter, then adoptNode() imports the element with the css class in lowercase.

importNode() doesn't have this problem, but is more heavyweight than adoptNode().

I can reproduce this problem on Safari 9.1.1 on El Capitan. I also have the same problem on iOS 9.3.2. This problem does not occur on Chrome 51 or IE11.

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