69680 2011-10-07 17:37:44 -0700 Dir attribute is converted into direction property when merging paragraphs 2011-10-11 18:06:54 -0700 1 1 1 Unclassified WebKit HTML Editing 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 68168 1 rniwa rniwa aharon darin enrica mitz playmobil spocke tony xji yael oldest_to_newest 480414 0 rniwa 2011-10-07 17:37:44 -0700 If a user presses delete key and merges two paragraphs between <div dir="ltr">X</div><div dir="rtl">Y</div> where X and Y can independently be LTR or RTL text, should we generate <div dir="ltr">XY</div> or <div dir="ltr">X<span dir="rtl">Y</div>? WebKit currently adds direction property when copying a content inside an element with dir property. But this wouldn't work if the copied content was wrapped by span (need to add unicode-bidi: embed as well). I don't even know what the correct behavior is. Test case (from the bug 45784): https://bug-45784-attachments.webkit.org/attachment.cgi?id=110125 480694 1 aharon 2011-10-09 03:21:36 -0700 Caveat: below are my personal opinions. I do not think that there is a standard to follow here. > should we generate <div dir="ltr">XY</div> > or <div dir="ltr">X<span dir="rtl">Y</div>? IMO, the former. The problem with the latter is that you are converting paragraph direction style to inline direction style. While paragraph direction is usually indicated by alignment, and most editors provide buttons to see it and control it, neither is the case for inline direction. Thus, later on, the user has no way of knowing that the <span dir=rtl> is there, and thus will be surprised when things work differently than they do normally. And even if the user figures out what's going on, he has no way of removing the inline direction style, and can not tell whether the caret is inside it or just next to it. This is all very different from the case with other styles, e.g. bolding, where the bolding is obvious in itself - and is made even more obvious by the status of its button, which also gives a way to control it. (However, this issue should be revisited if WebKit were to start supporting a visualization of the bidi structure of the content during editing.) > WebKit currently adds direction property when copying content > inside an element with dir property. But this wouldn't work if > the copied content was wrapped by span (need to add > unicode-bidi: embed as well). I don't even know what the correct > behavior is. First, about the dir attribute vs direction & unicode-embded styles: stay true to what the source has. If it has mark-up like the dir attribute, use that mark-up. Only use CSS if it has something beyond the mark-up. Now regarding copying directional information on the copy command. Here too, I think the guiding principle should be to avoid creating inline direction. Thus, if you are going to be creating a <div> or <p>, I think it is very good to put a dir on it in accordance with the source's computed style (even if the source did not have it explicitly on that element). And if the source already has a <span dir=...>, then by all means copy it verbatim. But I do not think that it is good to create a span with direction when the source did not have it. 481246 2 rniwa 2011-10-10 15:50:30 -0700 Thanks for the response, Aharon! (In reply to comment #1) > > should we generate <div dir="ltr">XY</div> > > or <div dir="ltr">X<span dir="rtl">Y</div>? > > IMO, the former. The problem with the latter is that you are converting paragraph direction style to inline direction style. While paragraph direction is usually indicated by alignment, and most editors provide buttons to see it and control it, neither is the case for inline direction. Right. It's really hard for users to figure out that the latter is happening. >Thus, later on, the user has no way of knowing that the <span dir=rtl> is there, and thus will be surprised when things work differently than they do normally. And even if the user figures out what's going on, he has no way of removing the inline direction style, and can not tell whether the caret is inside it or just next to it. Safari provides a context menu to do this but I agree that it's not so user-friendly if the user had to use it very often after copy-paste. > > WebKit currently adds direction property when copying content > > inside an element with dir property. But this wouldn't work if > > the copied content was wrapped by span (need to add > > unicode-bidi: embed as well). I don't even know what the correct > > behavior is. > > First, about the dir attribute vs direction & unicode-embded styles: stay true to what the source has. If it has mark-up like the dir attribute, use that mark-up. Only use CSS if it has something beyond the mark-up. This issue is a little tangential in my opinion. It's same problem as WebKit converting b to <span style="font-weight: bold"> in some cases. We can probably tackle this in some other bug. > Now regarding copying directional information on the copy command. Here too, I think the guiding principle should be to avoid creating inline direction. Thus, if you are going to be creating a <div> or <p>, I think it is very good to put a dir on it in accordance with the source's computed style (even if the source did not have it explicitly on that element). And if the source already has a <span dir=...>, then by all means copy it verbatim. But I do not think that it is good to create a span with direction when the source did not have it. Here's a tricky case what if an user selected a part of block? e.g. ([ and ] indicate the start and the end of selection below) <div dir="rtl">hello [world<p>WebKit</p>]</div> In this case, p is a block element and it has RTL directionality inherited from the parent div. Which one of the following markups should we generate? 1. world<p>WebKit</p> 2. world<p dir="rtl">WebKit</p> 3. <div dir="rtl">world<p>WebKit</p></div> I'd cross-out option 2 because "world" and "WebKit" would have different directionalities after paste and behave differently for <div dir="rtl">hello [world<br>WebKit]</div> 481615 3 aharon 2011-10-11 07:10:05 -0700 (In reply to comment #2) > (In reply to comment #1) > > > should we generate <div dir="ltr">XY</div> > > > or <div dir="ltr">X<span dir="rtl">Y</div>? > > > > IMO, the former. The problem with the latter is that you are converting > > paragraph direction style to inline direction style. While paragraph > > direction is usually indicated by alignment, and most editors provide > > buttons to see it and control it, neither is the case for inline direction. > > Thus, later on, the user has no way of knowing that the <span dir=rtl> is > > there, and thus will be surprised when things work differently than they do > > normally. And even if the user figures out what's going on, he has no way > > of removing the inline direction style, and can not tell whether the caret > > is inside it or just next to it. > > Safari provides a context menu to do this Wow, I did not realize this. > but I agree that it's not so user-friendly if the user had to use it very > often after copy-paste. Indeed. To see that the inline direction style is there, one has to highlight *exactly* the text covered by the span (not one character more) and click for the context menu. Not very discoverable. > > > WebKit currently adds direction property when copying content > > > inside an element with dir property. But this wouldn't work if > > > the copied content was wrapped by span (need to add > > > unicode-bidi: embed as well). I don't even know what the correct > > > behavior is. > > > > First, about the dir attribute vs direction & unicode-embded styles: stay > > true to what the source has. If it has mark-up like the dir attribute, use > > that mark-up. Only use CSS if it has something beyond the mark-up. > > This issue is a little tangential in my opinion. True. > It's same problem as WebKit converting b to <span style="font-weight: bold"> > in some cases. We can probably tackle this in some other bug. The problems are not of the same severity. Bolding is basically an issue of presentation, so style is the right way to do it (for which reason <b> had been deprecated at some point). Text direction is far more than presentation - it is the very nature of the text being displayed. The dir attribute is the right way to do it, and doing it in style alone is discouraged. But, as you said, this is not what this bug is about. > > Now regarding copying directional information on the copy command. Here > > too, I think the guiding principle should be to avoid creating inline > > direction. Thus, if you are going to be creating a <div> or <p>, I think it > > is very good to put a dir on it in accordance with the source's computed > > style (even if the source did not have it explicitly on that element). And > > if the source already has a <span dir=...>, then by all means copy it > > verbatim. But I do not think that it is good to create a span with > > direction when the source did not have it. > > Here's a tricky case what if an user selected a part of block? e.g. ([ and ] > indicate the start and the end of selection below) > <div dir="rtl">hello [world<p>WebKit</p>]</div> > > In this case, p is a block element and it has RTL directionality inherited > from the parent div. Which one of the following markups should we generate? > 1. world<p>WebKit</p> > 2. world<p dir="rtl">WebKit</p> > 3. <div dir="rtl">world<p>WebKit</p></div> > > I'd cross-out option 2 because "world" and "WebKit" would have different > directionalities after paste and behave differently for <div dir="rtl">hello > [world<br>WebKit]</div> Whatever you do, I do not think it should be a special case for directionality. That is, you should not come up with different element structures for two cases that only differ in elements having or not having a dir attribute. Probably the best way to think about it is to change the case to have a text-align style (which, by definition, is a block-level style) where it currently has a dir attribute and work backwards from there. So, what would you do for <div style="text-align:center">hello [world<p>WebKit</p>]</div>? The good thing about asking that question is that you do not have to limit yourself to a supposed bidi expert like myself. 481618 4 aharon 2011-10-11 07:18:43 -0700 (In reply to comment #3) > (In reply to comment #2) > > Safari provides a context menu to [set selection direction] > > Wow, I did not realize this. > BTW, this feature triggers a bug in Gmail. Let's say we have <div dir=ltr>hello <span dir=rtl>RTL!</span> world</div> When the user puts the caret inside the span, Gmail's LTR paragraph button becomes "non-pushed" and the RTL paragraph button becomes "pushed". This is already bad - the paragraph is *not* RTL. If one then clicks the LTR paragraph button, nothing happens - the "RTL!" is still displayed as "!RTL", while the LTR paragraph button stays non-pushed, and the RTL button stays pushed. 481814 5 rniwa 2011-10-11 12:20:58 -0700 (In reply to comment #3) > Whatever you do, I do not think it should be a special case for directionality. That is, you should not come up with different element structures for two cases that only differ in elements having or not having a dir attribute. Probably the best way to think about it is to change the case to have a text-align style (which, by definition, is a block-level style) where it currently has a dir attribute and work backwards from there. So, what would you do for <div style="text-align:center">hello [world<p>WebKit</p>]</div>? That's a good approach. We don't preserve text-align in this case so we should probably do the same for directionality. Thanks for your help! 481969 6 110590 rniwa 2011-10-11 15:42:03 -0700 Created attachment 110590 Patch 482049 7 110590 enrica 2011-10-11 17:01:37 -0700 Comment on attachment 110590 Patch Looks good to me 482051 8 rniwa 2011-10-11 17:05:27 -0700 Thanks for the review. 482111 9 rniwa 2011-10-11 18:06:54 -0700 Committed r97205: <http://trac.webkit.org/changeset/97205> 110590 2011-10-11 15:42:03 -0700 2011-10-11 17:01:37 -0700 Patch bug-69680-20111011154202.patch text/plain 13733 rniwa SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDk3MTg3KQorKysgU291cmNlL1dlYkNvcmUvQ2hhbmdl TG9nCSh3b3JraW5nIGNvcHkpCkBAIC0xLDMgKzEsMjIgQEAKKzIwMTEtMTAtMTEgIFJ5b3N1a2Ug Tml3YSAgPHJuaXdhQHdlYmtpdC5vcmc+CisKKyAgICAgICAgRGlyIGF0dHJpYnV0ZSBpcyBjb252 ZXJ0ZWQgaW50byBkaXJlY3Rpb24gcHJvcGVydHkgd2hlbiBtZXJnaW5nIHBhcmFncmFwaHMKKyAg 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