[webkit-dev] Adding ENABLE_CSS_DIRECTIONAL_FOCUS to WebCore.

[Kyounga Ra]

Hi webkit-dev!

I'd like to add new feature for CSS nav-[dir] properties.
https://bugs.webkit.org/show_bug.cgi?id=66027

This feature is for
http://dev.w3.org/csswg/css3-ui/#nav-dir
On recent discussion, these nav-* properties was dropped from level 3.
http://lists.w3.org/Archives/Public/www-style/2013Apr/0428.html

But, I need this feature. (I'm in the TV industry.)
Honestly, already implemented and have used it.
You can see my previous patch.

At that time, I thought that this is W3C standard and we didn't need to
develop it behind a defined feature name.
Now, this property was dropped from CSS.
So, is it okay implementing this feature behind
ENABLE_CSS_DIRECTIONAL_FOCUS?

I re-ported this feature  whenever I rebase my webkit.
It's troublesome job.

how about you
Adding "ENABLE_CSS_DIRECTIONAL_FOCUS" is not bad?

Any comments are welcome.

- Kyounga
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