141580 2015-02-13 16:52:17 -0800 REGRESSION (r179429): Backspace key does not work in Facebook comment fields 2015-02-21 08:06:54 -0800 1 1 1 Unclassified WebKit WebCore Misc. 528+ (Nightly build) Mac OS X 10.10 RESOLVED DUPLICATE 141859 InRadar P1 Normal --- 1 invalidname webkit-unassigned ap webkit-bug-importer ysuzuki oldest_to_newest 1069055 0 invalidname 2015-02-13 16:52:17 -0800 Visit Facebook (yeah, I know). Locate a post's reply block and focus on it. Start typing. Press backspace key to delete what you have typed. Nothing happens. 1069157 1 ap 2015-02-13 22:37:32 -0800 I could reproduce with nightly r180087. We need to bisect to find out what change broke this. 1069159 2 webkit-bug-importer 2015-02-13 22:37:43 -0800 <rdar://problem/19837231> 1069875 3 ap 2015-02-17 10:08:17 -0800 Turns out that this regressed with http://trac.webkit.org/changeset/179429 1070955 4 mrowe 2015-02-21 01:36:12 -0800 *** This bug has been marked as a duplicate of bug 141859 *** 1070966 5 ysuzuki 2015-02-21 08:06:54 -0800 Oops, it's my fault. Thank you for investigating it! After investigating the cause, it seems that, when window.Symbol is exposed, Object.getOwnPropertySymbols and the latest ES6 iterator interface are also required. So I'm now fixing this issue by hiding window.Symbol object to user web pages. It allow inspector to continue to use Symbol and its' already used.