157269 2016-05-02 10:12:07 -0700 TouchEvent objects shouldn't contain co-ordinates 2016-09-28 12:31:13 -0700 1 1 1 Unclassified WebKit UI Events Safari 9 iPhone / iPad Unspecified NEW P2 Normal --- 1 tdresser webkit-unassigned bdakin benjamin cdumez dino rbyers sam simon.fraser oldest_to_newest 1189421 0 tdresser 2016-05-02 10:12:07 -0700 TouchEvent objects shouldn't contain co-ordinates, co-ordinates should only reside on the associated Touch objects. See: https://www.w3.org/TR/uievents/#interface-UIEvent https://w3c.github.io/touch-events/#idl-def-TouchEvent To reproduce, visit jsbin.com/jalomi/quiet, and touch the screen. Nothing should be written to the screen, but the x co-ordinate of the first pointer is written to the screen. This behavior isn't spec compliant, and may cause compatibility issues. It also encourages sharing code for touch and mouse events, which seems to be something that isn't desired by Apple engineers. "The premise of the specification is that using mouse event and touch events interchangeably is needed. In reality, nobody was really asking for that because it is a terrible idea." https://lists.webkit.org/pipermail/webkit-dev/2012-November/022957.html 1189426 1 rbyers 2016-05-02 10:29:48 -0700 I assume this is because pageX, pageY, layerX, layerY are on UIEvent.idl in WebKit (https://github.com/WebKit/webkit/blob/66e68cd8d7bf4ea1cf52f31ed9cb242f83ea5b57/Source/WebCore/dom/UIEvent.idl). Chromium has never (AFAIK) reported non-zero values for TouchEvent.pageX/pageY/layerX/layerY, and we removed those properties from TouchEvent completely about a year ago (https://bugs.chromium.org/p/chromium/issues/detail?id=50327). We're not aware of a single website which is depending on seeing these properties on TouchEvents, so it's likely highly web compatible to move them from UIEvent to MouseEvent as we did in blink. 1234466 2 rbyers 2016-09-28 11:28:28 -0700 See https://bugs.webkit.org/show_bug.cgi?id=147740#c11 for discussion of the interaction between these non-standard properties and the standard constructor syntax.