[Webkit-unassigned] [Bug 138779] New: Using document.appendChild to create a new element with ID attribute creates a property / global variable on window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138779

            Bug ID: 138779
           Summary: Using document.appendChild to create a new element
                    with ID attribute creates a property / global variable
                    on window
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: seibzhen at gmail.com

Created attachment 241682
  --> https://bugs.webkit.org/attachment.cgi?id=241682&action=review
a web page with the steps used on the bug report

It seems that when using the DOM API to create new nodes on a webpage and specifying an ID attribute, a global variable / property on window object is created with the same name as the specified ID.

In the example attached, I am getting a reference to a paragraph in the body of the page. After that, I am creating a new div node and setting its id attribute to 'test_variable'.

In the next lines, I am appending it into the paragraph node reference I had gotten earlier using appendChild(). After that code is run, a new property on window is created, window.test_variable, having the reference to a HTMLDivElementConstructor.

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