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Re: [css-writing-modes][css-scoping] unicode-bidi in Shadow DOM, and possibly other properties?

From: Koji Ishii <kojiishi@gmail.com>
Date: Wed, 17 Dec 2014 21:34:14 +0900
Message-ID: <CAN9ydbU2XecdQa08sSomY47hsUu+To8rEzcdCWMTC84CwZFetQ@mail.gmail.com>
To: Simon Pieters <simonp@opera.com>
Cc: www-style list <www-style@w3.org>, public-i18n-bidi@w3.org
# Forgot to add [css-writing-modes] in the subject

On Wed, Dec 17, 2014 at 8:36 PM, Simon Pieters <simonp@opera.com> wrote:
> On Wed, 17 Dec 2014 11:56:36 +0100, Koji Ishii <kojiishi@gmail.com> wrote:
>> Can bi-di & CSS experts help us to figure out what to do with unicode-bidi
>> and Shadow DOM?
>> I’m thinking, at the Shadow DOM boundaries, the ‘unicode-bidi’ property
>> should be set to ‘isolate’ since that’s the value for bi-di to suffice the
>> philosophy of components IIUC. Is this correct? In Bidi Rules for HTML4[1],
>> I see <div>, <form>, etc. sets this, but I don’t see <input> or <textarea>,
>> so I’m not confident on this point and would appreciate any advices.
> Maybe https://html.spec.whatwg.org/multipage/rendering.html#bidi-rendering
> is more relevant than the "for HTML4" appendix.

Thank you, I didn't know this!!

What's more interesting to me is that this section uses dir="i", which
is not defined in either HTML spec[3][4].

"plaintext" value "behaves as 'isolate'", so probably 'isotelate' is
correct, and given dir="i" is not defined in HTML, probably sticking
on the "unicode-bidi" property is correct?

> (Can we drop those appendices? Why do we have them?)

Don't know, it's been there for more than 3 years. I'm ok to remove,
if no one objects.

>> The next question is, assuming so, what is the best way to force that.
>> Looking at Inheritance section of CSS Scoping[2], since top-level elements
>> of a shadow tree inherit from their host element, so I guess we should let
>> the computed value of ‘unicode-bidi’ of the host elements to ‘isolate’. Is
>> this correct approach?
>> And the third and the last, I can’t find any other properties for the
>> Shadow DOM to handle differently than normal inheritance. Can someone find
>> any?

And any insights for these two questions?

>> [1] http://dev.w3.org/csswg/css-writing-modes/#bidi-html
>> [2] http://dev.w3.org/csswg/css-scoping/#inheritance

[3] https://html.spec.whatwg.org/multipage/dom.html#the-dir-attribute
[4] http://www.w3.org/TR/html5/dom.html#the-dir-attribute
Received on Wednesday, 17 December 2014 12:34:41 UTC

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