[Webkit-unassigned] [Bug 172687] New: Can't use Object.defineProperty() to add an item to a DOMStringMap or Storage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172687

            Bug ID: 172687
           Summary: Can't use Object.defineProperty() to add an item to a
                    DOMStringMap or Storage
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Bindings
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sam at webkit.org
                CC: cdumez at apple.com

Created attachment 311447

  --> https://bugs.webkit.org/attachment.cgi?id=311447&action=review

Test case

Using Object.defineProperty() to add a item to a DOMStringMap does not seem to work. Given an dataset create like so:

    let element = document.createElement("div");
    element.dataset["a"] = "1";
    element.dataset["b"] = "2";

If you try to add an additional item like so:

    Object.defineProperty(element.dataset, "key", {
        value: 'value'
    });

The element remains unchanged (This is shown in the test case by printing out element.outerHTML).

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