194765 2019-02-17 13:28:08 -0800 Animation of font-size with rem values is incorrect 2020-05-19 09:00:37 -0700 1 1 1 Unclassified WebKit Animations Safari 12 All Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=194749 https://codepen.io/scottkellum/pen/28d147aa4b21d84367ce832a986cd549?editors=0100 InRadar P2 Major --- 1 scott webkit-unassigned dino graouts graouts koivisto litherum mmaxfield scott simon.fraser webkit-bug-importer zalan oldest_to_newest 1507141 0 scott 2019-02-17 13:28:08 -0800 Rem units are intermittently miscalculated on load within animations. This happens in Safari 12 both on my Mac and iOS. Occasionally it will render correctly but on refreshes it more often than not renders incorrectly. Replicate the bug: https://codepen.io/scottkellum/pen/28d147aa4b21d84367ce832a986cd549?editors=1100 Possibly related: https://bugs.webkit.org/show_bug.cgi?id=194749 If the animation is toggled off and back on or set late with javascript it will work again. 1507333 1 webkit-bug-importer 2019-02-18 11:30:48 -0800 <rdar://problem/48171742> 1507334 2 simon.fraser 2019-02-18 11:32:27 -0800 Seems to only reproduce with Web Animations enabled. 1653565 3 399640 graouts 2020-05-18 05:27:51 -0700 Created attachment 399640 Test 1653566 4 graouts 2020-05-18 05:30:30 -0700 If you remove the animation-delay and animation-play-state values in the animation shorthand you can see the animation running and using what looks like `font-size: 1rem` for the 50% keyframe. 1653568 5 graouts 2020-05-18 05:51:53 -0700 If you change the keyframes to this: @keyframes anim { 0% { font-size: 2rem; } 50% { font-size: 6rem; } 100% { font-size: 2rem; } } This sets the value to what looks like 0.5rem for the duration of the entire animation. So setting explicit 0% and 100% keyframes show different results. 1653573 6 graouts 2020-05-18 06:26:04 -0700 The way we compute the styles on the KeyframeListValue objects is all wrong, which explains why we get no animation for the explicit keyframes case, they're all resolving to the same value. 1653574 7 graouts 2020-05-18 06:26:51 -0700 This happens because CSSPrimitiveValue::computeNonCalcLengthDouble() has no conversionData.rootStyle(). 1653582 8 399643 graouts 2020-05-18 06:55:34 -0700 Created attachment 399643 Test 1653988 9 399733 koivisto 2020-05-19 07:37:35 -0700 Created attachment 399733 patch 1653993 10 399733 graouts 2020-05-19 07:49:45 -0700 Comment on attachment 399733 patch View in context: https://bugs.webkit.org/attachment.cgi?id=399733&action=review > LayoutTests/animations/keyframe-rem-unit.html:20 > + testRunner.waitUntilDone(); > + await document.getAnimations()[0].finished; > + testRunner.notifyDone(); If you write an animation that use a rem unit in the "from" keyframe then you could write this to only wait for the animation's "ready" promise which would run the test one animation frame faster I think. Hopefully that works. 1653994 11 graouts 2020-05-19 07:50:50 -0700 Does this patch also fix bug 194749? 1653999 12 399735 koivisto 2020-05-19 08:06:29 -0700 Created attachment 399735 patch 1654001 13 koivisto 2020-05-19 08:20:49 -0700 (In reply to Antoine Quint from comment #11) > Does this patch also fix bug 194749? Nope, but I think it is related. The base style for 'em' resolution is similarly wrong (it should be the parent element style). 1654014 14 ews-feeder 2020-05-19 09:00:35 -0700 Committed r261861: <https://trac.webkit.org/changeset/261861> All reviewed patches have been landed. Closing bug and clearing flags on attachment 399735. 399640 2020-05-18 05:27:51 -0700 2020-05-18 06:55:08 -0700 Test 194765.html text/html 428 graouts PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPGhlYWQ+Cjx0aXRsZT5CdWcgMTk0NzY1 PC90aXRsZT4KPHN0eWxlPgoKaDEgewogIGZvbnQtc2l6ZTogMnJlbTsKICBhbmltYXRpb246IGFu aW0gMXMgbGluZWFyIDEgLS41cyBwYXVzZWQ7CiAgYm9yZGVyLWJvdHRvbTogMXJlbSBzb2xpZDsK fQoKQGtleWZyYW1lcyBhbmltIHsKICAgIDAlIHsKICAgICAgICBjb2xvcjogcmVkCiAgICB9Cgog ICAgNTAlIHsKICAgICAgICBmb250LXNpemU6IDZyZW07CiAgICAgICAgYm9yZGVyLWJvdHRvbTog NnJlbSBzb2xpZDsKICAgICAgICBjb2xvcjogZ3JlZW47CiAgICB9CgogICAgMTAwJSB7CiAgICAg ICAgY29sb3I6IGJsdWUKICAgIH0KfQo8L3N0eWxlPgo8L2hlYWQ+Cjxib2R5Pgo8aDE+SGVsbG8g d29ybGQhPC9oMT4KPC9ib2R5Pgo8L2h0bWw+Cgo= 399643 2020-05-18 06:55:34 -0700 2020-05-18 06:55:34 -0700 Test 194765.html text/html 247 graouts PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPHRpdGxlPkJ1ZyAxOTQ3NjU8L3RpdGxlPgo8 c3R5bGU+CgpoMSB7CiAgZm9udC1zaXplOiAycmVtOwogIGFuaW1hdGlvbjogYW5pbSAxcyBsaW5l 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