247826 2022-11-11 15:03:18 -0800 Serialization differences with "columns" with one or more `auto` value 2022-11-14 19:25:17 -0800 1 1 1 Unclassified WebKit CSS Safari Technology Preview Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=247745 https://github.com/web-platform-tests/wpt/pull/36948 BrowserCompat, InRadar P2 Normal --- 1 ahmad.saleem792 ntim bfulgham emilio karlcow ntim obrufau simon.fraser webkit-bug-importer zalan oldest_to_newest 1911908 0 ahmad.saleem792 2022-11-11 15:03:18 -0800 Hi Team, While going through Bug 103597 and trying to see "column-count: auto" support, I came across following Blink Commit: Blink Commit - https://src.chromium.org/viewvc/blink?view=revision&revision=155047 I took the test case from above commit and changed it into "JSFiddle" below: Link - https://jsfiddle.net/2jhw4k5x/show It seems that we fail following tests compared to Chrome Canary 109: FAIL element.style.WebkitColumns should be auto auto. Was auto. FAIL element.style.WebkitColumns should be auto auto. Was auto. FAIL element.style.WebkitColumns should be auto auto. Was auto. FAIL element.style.WebkitColumns should be auto 7. Was 7. FAIL element.style.WebkitColumns should be 7em auto. Was 7em. Rather than opening old bug, I just thought to create a separate to track this issue. Thanks! 1912029 1 ntim 2022-11-12 14:27:47 -0800 This was already fixed in https://commits.webkit.org/182834@main The remaining cases you reported are about serialization differences, what we do is correct given the guideline is always to use the shortest form. auto auto -> auto auto 7 -> 7 7em auto -> 7em. Seems reasonable IMO as I don't see a case where this could cause ambiguity, but we can always adjust. Firefox seems to be like Chrome and always serializes both for the shorthand: https://jsfiddle.net/3nd4w5qh/show Oriol, Emilio, wdyt? 1912039 2 obrufau 2022-11-12 16:16:07 -0800 Yes I would say that omitting optional values seems more correct. https://drafts.csswg.org/cssom/#serialize-a-css-value > If component values can be omitted or replaced with a shorter representation without changing the meaning of the value, omit/replace them. 1912059 3 463505 ntim 2022-11-12 23:48:13 -0800 Created attachment 463505 Testcase from chromium 1912060 4 ntim 2022-11-12 23:56:33 -0800 https://github.com/web-platform-tests/wpt/blob/a6e9e432ca/css/css-multicol/parsing/columns-valid.html should probably be extended to cover everything in the testcase. Also I notice WebKit is inconsistent on omitting explicit or implicit `auto`. Probably makes sense to omit in both case? 1912071 5 obrufau 2022-11-13 01:34:34 -0800 I think WebKit should just remove the notion of implicit values. 1912073 6 webkit-bug-importer 2022-11-13 01:56:59 -0800 <rdar://problem/102287297> 1912074 7 ntim 2022-11-13 02:06:28 -0800 Pull request: https://github.com/WebKit/WebKit/pull/6441 1912100 8 emilio 2022-11-13 12:50:45 -0800 Yeah agreed omitting redundant values is more correct, in Gecko this is what causes the behavior: https://searchfox.org/mozilla-central/rev/219df29d0fb5d8928ae41bba4a605046de411cf0/servo/components/style/properties/shorthands/column.mako.rs#11 I'd be happy to change to follow suit here if you file a bug :) 1912101 9 ahmad.saleem792 2022-11-13 12:54:52 -0800 (In reply to Emilio Cobos Álvarez (:emilio) from comment #8) > Yeah agreed omitting redundant values is more correct, in Gecko this is what > causes the behavior: > https://searchfox.org/mozilla-central/rev/ > 219df29d0fb5d8928ae41bba4a605046de411cf0/servo/components/style/properties/ > shorthands/column.mako.rs#11 > > I'd be happy to change to follow suit here if you file a bug :) https://bugzilla.mozilla.org/show_bug.cgi?id=1800394 1912152 10 ews-feeder 2022-11-13 20:00:11 -0800 Committed 256625@main (492c75edf7c7): <https://commits.webkit.org/256625@main> Reviewed commits have been landed. Closing PR #6441 and removing active labels. 463505 2022-11-12 23:48:13 -0800 2022-11-12 23:48:24 -0800 Testcase from chromium file_247826.html text/html 32311 ntim PCFET0NUWVBFIGh0bWw+DQo8aHRtbD4NCiAgPGhlYWQ+DQogICAgPHRpdGxlPidjb2x1bW5zJyBw cm9wZXJ0eSB3aXRoICdhdXRvJyBhbmQgc29tZXRoaW5nIGVsc2U8L3RpdGxlPg0KICAgIDxzY3Jp cHQ+DQogICAgaWYgKHNlbGYudGVzdFJ1bm5lcikgew0KCS8vIHN2Zy9keW5hbWljLXVwZGF0ZXMg dGVzdHMgc2V0IGVuYWJsZVBpeGVsVGVzdGluZz10cnVlLCBhcyB3ZSB3YW50IHRvIGR1bXAgdGV4 dCArIHBpeGVsIHJlc3VsdHMNCiAgICBpZiAoc2VsZi5lbmFibGVQaXhlbFRlc3RpbmcpDQogICAg ICAgIHRlc3RSdW5uZXIuZHVtcEFzVGV4dFdpdGhQaXhlbFJlc3VsdHMoKTsNCiAgICBlbHNlDQog ICAgICAgIHRlc3RSdW5uZXIuZHVtcEFzVGV4dCgpOw0KfQ0KDQp2YXIgZGVzY3JpcHRpb24sIGRl YnVnLCBkaWRGYWlsU29tZVRlc3RzLCBzdWNjZXNzZnVsbHlQYXJzZWQ7DQoNCmRpZEZhaWxTb21l VGVzdHMgPSBmYWxzZTsNCg0KdmFyIGV4cGVjdGluZ0Vycm9yOyAvLyBzZXQgYnkgc2hvdWxkSGF2 ZUVycm9yKCkNCnZhciBleHBlY3RlZEVycm9yTWVzc2FnZTsgLy8gc2V0IGJ5IG9uZXJyb3Igd2hl 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