[Webkit-unassigned] [Bug 161454] New: Element.dataset.name incorrectly returns undefined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161454

            Bug ID: 161454
           Summary: Element.dataset.name incorrectly returns undefined
    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: robertknight at gmail.com
                CC: cdumez at apple.com

The example at https://gist.github.com/robertknight/38784b71ddba63b1604b2c6244f216a1 walks the DOM and builds a map of name -> Element where the name is taken from the `data-ref` attribute. On Firefox, Chrome and Edge it successfully reads the `Element.dataset` values and displays `searchBucket, header, content`. On iOS Safari 9.3.5 (tested on an iPhone 5), Safari 9.1.2 (OS X 10.11) it very occasionally displays the correct values but usually reads all the `Element.dataset.ref` values as undefined.

The problem disappears with small modifications to the DOM structure, such as deleting a few of the `div` elements, other than the ones with `data-ref` attributes.

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