This bug was introduced in https://webkit.org/b/192917. Steps to Reproduce: 1. Inspect daringfireball.net 2. Open Elements tab 3. Reload the page TypeError: this._indexesForSubtree is not a function. (In 'this._indexesForSubtree(child)', 'this._indexesForSubtree' is undefined) (at TreeOutline.js:332:53) removeChildAtIndex @ TreeOutline.js:332:53 _updateChildren @ DOMTreeElement.js:494:36 _updateChildren @ [native code] getChildNodes @ DOMNode.js:490:25 updateChildren @ DOMTreeElement.js:420:45 _updateModifiedNodes @ DOMTreeUpdater.js:125:49 performWork @ Utilities.js:1501:47
<rdar://problem/47323967>
Created attachment 359285 [details] Patch
Comment on attachment 359285 [details] Patch Looks good. I can't reproduce the exception anymore.
Comment on attachment 359285 [details] Patch r=me
Comment on attachment 359285 [details] Patch Clearing flags on attachment: 359285 Committed r240051: <https://trac.webkit.org/changeset/240051>
All reviewed patches have been landed. Closing bug.