78594 2012-02-14 02:50:43 -0800 unicode-bidi:plaintext should make all-neutral paragraphs LTR 2022-10-04 10:52:31 -0700 1 1 1 Unclassified WebKit Text 528+ (Nightly build) All All RESOLVED CONFIGURATION CHANGED InRadar P2 Normal --- 50910 1 aharon webkit-unassigned ahmad.saleem792 eric igor.oliveira leviw mmaxfield playmobil rniwa webkit-bug-importer xji oldest_to_newest 556166 0 126948 aharon 2012-02-14 02:50:43 -0800 Created attachment 126948 test case being submitted to W3C's HTML5 test suite Currently, in a unicode-bidi:-webkit-plaintext element, paragraphs that contain no strongly left-to-right (bidi class L) or right-to-left (bidi class R and AL) characters default to the element's computed direction style. This is bad because it does not conform to http://www.w3.org/TR/css3-writing-modes/, which states that "the base directionality of each bidi paragraph for which the element forms the containing block is determined not by the element's computed ‘direction’ as usual, but by following the heuristic in rules P2 and P3 of the Unicode bidirectional algorithm". In turn, http://unicode.org/reports/tr9/#P3 states that "if a character is found in P2 and it is of type AL or R, then set the paragraph embedding level to one; otherwise, set it to zero." Paragraph level 0 is LTR. Gecko's implementation of unicode-bidi:plaintext suffers from the exact same problem, but they are about to fix it. See https://bugzilla.mozilla.org/show_bug.cgi?id=726420. Please note that the exact definition of unicode-bidi:plaintext is relevant even when the element has dir=auto (which assigns unicode-bidi:plaintext by default for <pre> and <textarea>, and is probably more likely to be used than unicode-bidi:plaintext directly), even though part of the definition of dir=auto is that the element is assigned a CSS direction using the first-strong algorithm. The exact definition of still makes a difference in a case like this: <pre dir=auto> א! --> </pre> This will result in the second line being displayed <-- if unicode-bidi:plaintext for all-neutral paragraphs depends on the computed direction of the element, but it being displayed --> if all-neutral paragraphs are always LTR. The test case I am attaching is elaboration of this example. Despite all of the above, I think that there is room for "fudging" a little and making the direction of a completely empty (not just all-neutral) paragraph match the direction of the preceding paragraph, and if there is none, then the computed direction. The purpose of this would be just to set the alignment (when text-align is start or end) such that when typing a sequence of RTL paragraphs in a unicode-bidi:plaintext textarea, one will not initially start off with the caret on the left for each new paragraph. This little tweak will have no affect whatsoever on the display of text outside of a textarea, where the direction of an empty paragraph is a moot point. But this is just icing; the basic point of this bug is that all-neutral paragraphs should default to LTR. 562936 1 aharon 2012-02-23 00:54:11 -0800 Please note that the corresponding bug has now been fixed in Mozilla, see https://bugzilla.mozilla.org/show_bug.cgi?id=726420 987664 2 igor.oliveira 2014-03-06 05:53:43 -0800 Related patch in blink: https://src.chromium.org/viewvc/blink?revision=156664&view=revision 1872821 3 ahmad.saleem792 2022-05-30 14:56:47 -0700 This issue is still reproducible in Safari 15.5 on macOS 12.4. All other browsers Chrome and Firefox matches each other. Thanks! 1873026 4 webkit-bug-importer 2022-05-31 10:22:34 -0700 <rdar://problem/94161105> 1901032 5 ahmad.saleem792 2022-09-25 10:40:40 -0700 I am not able to reproduce this now in Safari 16 and Safari Technology Preview 154 using attached testcase and both look same. Is it something fixed since Safari 15.5? Can someone confirm besides myself? Thanks! 126948 2012-02-14 02:50:43 -0800 2012-02-14 02:50:43 -0800 test case being submitted to W3C's HTML5 test suite dir_auto-textarea-N-between-Rs.html text/html 2519 aharon PCFET0NUWVBFIGh0bWw+DQo8aHRtbD4NCiAgPGhlYWQ+DQogICAgPG1ldGEgY2hhcnNldD0idXRm LTgiIC8+DQogICAgPHRpdGxlPkhUTUwgVGVzdDogdGV4dGFyZWEgd2l0aCBkaXI9YXV0bywgYWxs LU4gYmV0d2VlbiBhbGwtUnM8L3RpdGxlPg0KICAgIDxsaW5rIHJlbD0icmVmZXJlbmNlIiBocmVm PSJkaXJfYXV0by10ZXh0YXJlYS1OLWJldHdlZW4tUnMtcmVmLmh0bWwiIC8+DQogICAgPGxpbmsg cmVsPSJhdXRob3IiIHRpdGxlPSJBaGFyb24gTGFuaW4iIGhyZWY9Im1haWx0bzphaGFyb25AZ29v Z2xlLmNvbSIgLz4NCiAgICA8bGluayByZWw9ImF1dGhvciIgdGl0bGU9IkhUTUw1IGJpZGkgdGVz dCBXRyIgaHJlZj0ibWFpbHRvOmh0bWw1YmlkaUBnb29nbGVncm91cHMuY29tIiAvPg0KICAgIDxs aW5rIHJlbD0iaGVscCIgaHJlZj0iaHR0cDovL2Rldi53My5vcmcvaHRtbDUvc3BlYy9PdmVydmll dy5odG1sI3RoZS1kaXItYXR0cmlidXRlIiAvPg0KICAgIDxsaW5rIHJlbD0iaGVscCIgaHJlZj0i aHR0cDovL2Rldi53My5vcmcvY3Nzd2cvY3NzMy13cml0aW5nLW1vZGVzLyN1bmljb2RlLWJpZGkw IiAvPg0KICAgIDxtZXRhIG5hbWU9ImFzc2VydCIgY29udGVudD0iDQogICAgICBXaGVuIGRpcj0n YXV0bycsIHRoZSBkaXJlY3Rpb24gaXMgc2V0IGFjY29yZGluZyB0byB0aGUgZmlyc3Qgc3Ryb25n IGNoYXJhY3Rlcg0KICAgICAgb2YgdGhlIHRleHQuDQogICAgICBGb3IgdGV4dGFyZWEgYW5kIHBy ZSBlbGVtZW50cywgdGhlIGhldXJpc3RpYyBpcyBhcHBsaWVkIG9uIGEgcGVyLXBhcmFncmFwaCBs ZXZlbC4NCiAgICAgIElmIHRoZXJlIGlzIG5vIHN0cm9uZyBjaGFyYWN0ZXIsIGFzIGluIHRoaXMg dGVzdCwgdGhlIGRpcmVjdGlvbiBkZWZhdWx0cyB0byBMVFIuIiAvPg0KICAgIDxzdHlsZT4NCiAg ICAgIGJvZHksIHRleHRhcmVhIHsNCiAgICAgICAgZm9udC1zaXplOjE4cHg7DQogICAgICAgIHRl eHQtYWxpZ246bGVmdDsNCiAgICAgIH0NCiAgICAgIC50ZXN0LCAucmVmIHsNCiAgICAgICAgYm9y ZGVyOiBtZWRpdW0gc29saWQgZ3JheTsNCiAgICAgICAgd2lkdGg6IDQwMHB4Ow0KICAgICAgICBt YXJnaW46IDIwcHg7DQogICAgICB9DQogICAgICAuY29tbWVudHMgew0KICAgICAgICBkaXNwbGF5 OiBub25lOw0KICAgICAgfQ0KICAgIDwvc3R5bGU+DQogIDwvaGVhZD4NCiAgPGJvZHk+DQogICAg PGRpdiBjbGFzcz0iaW5zdHJ1Y3Rpb25zIj48cD5UZXN0IHBhc3NlcyBpZiB0aGUgdHdvIGJveGVz IGJlbG93IGxvb2sgZXhhY3RseSB0aGUgc2FtZS48L3A+PC9kaXY+DQogICAgPGRpdiBjbGFzcz0i Y29tbWVudHMiPg0KICAgICAgS2V5IHRvIGVudGl0aWVzIHVzZWQgYmVsb3c6DQogICAgICAgICYj eDA1RDA7IC0gVGhlIEhlYnJldyBsZXR0ZXIgQWxlZiAoc3Ryb25nbHkgUlRMKS4NCiAgICAgIFdl IHVzZSB0ZXh0LWFsaWduOmxlZnQgYmVjYXVzZSBuZWl0aGVyIHRoZSBkaXI9ImF1dG8iIG5vciB0 aGUgdW5pY29kZS1iaWRpOnBsYWludGV4dA0KICAgICAgc3BlY2lmaWNhdGlvbiBzdGF0ZXMgd2hl dGhlciB0ZXh0LWFsaWduOnN0YXJ0IGFuZCB0ZXh0LWFsaWduOmVuZCBzaG91bGQgb2JleSB0aGUg cGFyYWdyYXBoDQogICAgICBkaXJlY3Rpb24gb3IgdGhlIGRpcmVjdGlvbiBwcm9wZXJ0eSBpbiBh IHVuaWNvZGUtYmlkaTpwbGFpbnRleHQgZWxlbWVudC4NCiAgICAgIFRoZSAuLi4hIHBhcmFncmFw aCwgYmVpbmcgbmV1dHJhbCwgaXMgc3VwcG9zZWQgdG8gYmUgZGlzcGxheWVkIExUUiAoaS5lLiBh cyAuLi4hLCBub3QgYXMgIS4uLikNCiAgICAgIGRlc3BpdGUgYm90aCB0aGUgcGFyYWdyYXBoIGJl Zm9yZSBpdCBhbmQgdGhlIHBhcmFncmFwaCBhZnRlciBpdCBiZWluZyBhbGwtUlRMLCB3aGljaCBt YWtlcyB0aGUNCiAgICAgIGVsZW1lbnQgYXMgYSB3aG9sZSBSVEwuDQogICAgPC9kaXY+DQogICAg PGRpdiBjbGFzcz0idGVzdCI+DQogICAgICA8ZGl2IGRpcj0ibHRyIj4NCiAgICAgICAgPHRleHRh cmVhIHJvd3M9IjQiIGRpcj0iYXV0byI+DQomI3gwNUQwOw0KLi4uIQ0KJiN4MDVEMDsNCiAgICAg ICAgPC90ZXh0YXJlYT4NCiAgICAgIDwvZGl2Pg0KICAgICAgPGRpdiBkaXI9InJ0bCI+DQogICAg ICAgIDx0ZXh0YXJlYSByb3dzPSI0IiBkaXI9ImF1dG8iPg0KJiN4MDVEMDsNCi4uLiENCiYjeDA1 RDA7DQogICAgICAgIDwvdGV4dGFyZWE+DQogICAgICA8L2Rpdj4NCiAgICA8L2Rpdj4NCiAgICA8 ZGl2IGNsYXNzPSJyZWYiPg0KICAgICAgPGRpdiBkaXI9Imx0ciI+DQogICAgICAgIDx0ZXh0YXJl YSByb3dzPSI0IiBkaXI9InJ0bCI+DQomI3gwNUQwOw0KIS4uLg0KJiN4MDVEMDsNCiAgICAgICAg PC90ZXh0YXJlYT4NCiAgICAgIDwvZGl2Pg0KICAgICAgPGRpdiBkaXI9InJ0bCI+DQogICAgICAg IDx0ZXh0YXJlYSByb3dzPSI0IiBkaXI9InJ0bCI+DQomI3gwNUQwOw0KIS4uLg0KJiN4MDVEMDsN CiAgICAgICAgPC90ZXh0YXJlYT4NCiAgICAgIDwvZGl2Pg0KICAgIDwvZGl2Pg0KICA8L2JvZHk+ DQo8L2h0bWw+DQo=