161911 2016-09-13 09:34:54 -0700 Remove non-standard postMessage overload 2016-12-05 16:14:05 -0800 1 1 1 Unclassified WebKit Bindings WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 phistuck webkit-unassigned ap cdumez rbyers sam oldest_to_newest 1229181 0 phistuck 2016-09-13 09:34:54 -0700 https://github.com/WebKit/webkit/blob/da2308ab63592f69d45afcdccc7ee82a6a9edebe/Source/WebCore/bindings/js/JSDOMWindowCustom.cpp#L529 Chrome 54 removes it - https://bugs.chromium.org/p/chromium/issues/detail?id=425896#c16 1229193 1 cdumez 2016-09-13 10:26:38 -0700 Looks like Safari is the only browser support the overload now. However, based on Chromium's intent to deprecate [1], usage is not that low (0.002%) and most usage is from Mac. [1] https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/h4ooaB_Y9JE/nh7vXshGBwAJ 1229272 2 phistuck 2016-09-13 12:59:18 -0700 The Blink threshold is 0.02%, so this is well below the threshold (I understand that you may have a different threshold). Rick, can you share the macOS only percentage? 1229278 3 phistuck 2016-09-13 13:02:54 -0700 Also, it looks like the general metric is even lower now (0.0012). https://www.chromestatus.com/metrics/feature/timeline/popularity/575 1256570 4 sam 2016-12-05 16:14:05 -0800 Fixed in r209303: <http://trac.webkit.org/changeset/209303>