200204 2019-07-28 12:38:06 -0700 Content in <iframe> should override "touch-action" set in embedding document 2020-04-08 14:44:04 -0700 1 1 1 Unclassified WebKit CSS WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=200205 https://bugs.webkit.org/show_bug.cgi?id=210041 InRadar P2 Normal --- 200853 1 simon.fraser webkit-unassigned commit-queue graouts koivisto simon.fraser oldest_to_newest 1556426 0 simon.fraser 2019-07-28 12:38:06 -0700 What should be the behavior of touch-action on an <iframe>? Should it override the touch-actions of the iframe contents or not? 1561978 1 graouts 2019-08-16 01:24:27 -0700 I would have expected them to, but the spec doesn't seem to say anything in that regard. Empirically, the attached test shows in the Chrome dev tools using Pixel 2 as the emulated device that scrollable content in an <iframe> does scroll when the top-level document has "touch-action: none" set. 1561979 2 376484 graouts 2019-08-16 01:24:46 -0700 Created attachment 376484 Test 1562010 3 koivisto 2019-08-16 04:57:13 -0700 <rdar://problem/54355249> 1562011 4 376493 koivisto 2019-08-16 05:04:43 -0700 Created attachment 376493 patch 1562016 5 koivisto 2019-08-16 06:07:11 -0700 (In reply to Antoine Quint from comment #1) > I would have expected them to, but the spec doesn't seem to say anything in > that regard. Empirically, the attached test shows in the Chrome dev tools > using Pixel 2 as the emulated device that scrollable content in an <iframe> > does scroll when the top-level document has "touch-action: none" set. I don't think spec is ambiguous about this: "A touch behavior is supported if it conforms to the touch-action property of each element between the hit tested element and its nearest ancestor with the default touch behavior (including both the hit tested element and the element with the default touch behavior)." With iframe content the "nearest ancestor with the default touch behavior" is the iframe. If there is no 'touch-action' set in any of the elements between the touch element and the iframe then default touch-action (auto) is applied, no matter what it is set in iframes ancestors. 1562017 6 koivisto 2019-08-16 06:18:17 -0700 Well, I suppose it is bit ambiguous what "nearest ancestor with the default touch behavior" exactly means for frame content as <iframe> is not a DOM ancestor of its content document. Whatever the interpretation is it doesn't affect this bug though. 1562044 7 376493 commit-queue 2019-08-16 08:48:09 -0700 Comment on attachment 376493 patch Clearing flags on attachment: 376493 Committed r248772: <https://trac.webkit.org/changeset/248772> 1562045 8 commit-queue 2019-08-16 08:48:10 -0700 All reviewed patches have been landed. Closing bug. 1562410 9 commit-queue 2019-08-16 22:15:42 -0700 Re-opened since this is blocked by bug 200853 1562446 10 376598 koivisto 2019-08-17 00:30:21 -0700 Created attachment 376598 alternative fix Instead of generating the event region for frame top layer (the previous patch) simply treat the missing region as indicating touch-action:none when resolving touch-actions in UI process. 1562447 11 376599 koivisto 2019-08-17 00:33:42 -0700 Created attachment 376599 patch 1562458 12 376599 commit-queue 2019-08-17 01:50:19 -0700 Comment on attachment 376599 patch Clearing flags on attachment: 376599 Committed r248819: <https://trac.webkit.org/changeset/248819> 1562459 13 commit-queue 2019-08-17 01:50:21 -0700 All reviewed patches have been landed. Closing bug. 376484 2019-08-16 01:24:46 -0700 2019-08-16 01:24:46 -0700 Test touch-action-with-iframe.html text/html 650 graouts PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KICAgIDx0aXRsZT50b3VjaC1hY3Rpb24gdGVz dGluZzwvdGl0bGU+CiAgICA8bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVudD0id2lkdGg9ZGV2 aWNlLXdpZHRoLCBpbml0aWFsLXNjYWxlPTEiPgogICAgPHN0eWxlPgoKYm9keSB7CiAgICB0b3Vj aC1hY3Rpb246IG5vbmU7CiAgICBtYXJnaW46IDA7Cn0KCiogewogICAgcG9zaXRpb246IGFic29s dXRlOwogICAgbGVmdDogMDsKICAgIHRvcDogMDsKfQoKLnNjcm9sbGFibGUgewogICAgd2lkdGg6 IDIwMHZ3OwogICAgaGVpZ2h0OiAyMDB2aDsKICAgIGJhY2tncm91bmQtY29sb3I6IGJsdWU7Cn0K CiAgICA8L3N0eWxlPgo8L2hlYWQ+Cjxib2R5PgogICAgPGRpdiBjbGFzcz0ic2Nyb2xsYWJsZSI+ PC9kaXY+CiAgICA8aWZyYW1lPjwvaWZyYW1lPgogICAgPHNjcmlwdD4KCiAgICAgICAgZG9jdW1l bnQucXVlcnlTZWxlY3RvcigiaWZyYW1lIikuY29udGVudERvY3VtZW50LmJvZHkuYXBwZW5kQ2hp bGQoZG9jdW1lbnQuY3JlYXRlRWxlbWVudCgiZGl2IikpLnN0eWxlID0gIndpZHRoOiAyMDB2dzsg aGVpZ2h0OiAyMDB2aDsgYmFja2dyb3VuZC1jb2xvcjogZ3JlZW4iOwogICAgICAgIAogICAgPC9z 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