AX: Add support for CSS4 :focus-within pseudo

[James Craig]

AX: Add support for CSS4 :focus-within pseudo
http://dev.w3.org/csswg/selectors-4/#focus-within-pseudo

[Radar WebKit Bug Importer]

<rdar://problem/19389705>

[James Craig]

This would be a good addition for accessibility and full keyboard access.

[James Craig]

Seems like it's equivalent to the recently-removed CSS4 subject selector.
"!* *:focus" == "*:focus-within"

[Benjamin Poulain]

Created attachment 281810 [details]
Patch

[Antti Koivisto]

Comment on attachment 281810 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=281810&action=review

> Source/WebCore/dom/ContainerNode.cpp:108
> -    if (!child.renderer() && !child.isNamedFlowContentNode() && !childIsHTMLSlotElement)
> +    bool isElement = is<Element>(child);
> +    if (!child.renderer() && !childIsHTMLSlotElement
> +        && !(isElement && downcast<Element>(child).isNamedFlowContentElement()))

It would have been nicer to do the NamedFlow bit freeing dance separately.

> Source/WebCore/dom/Element.h:761
> +inline void Element::setHasFocusWithin(bool flag)
> +{
> +    setFlag(flag, HasFocusWithin);
> +    if (styleAffectedByFocusWithin())
> +        setNeedsStyleRecalc();
> +}

Would it be sufficient to invalidate only when the flag value changes?

> LayoutTests/fast/css/css-selector-text.html:313
> +testSelectorRoundTrip("a[b]:default");
> +testSelectorRoundTrip("a.b:default");
> +testSelectorRoundTrip("a#b:default");
> +testSelectorRoundTrip("a[b].c#d:default");

Is there anything sufficiently complicated here to test the SelectorChecker path?

[Antti Koivisto]

> Is there anything sufficiently complicated here to test the SelectorChecker
> path?

Quoted wrong test but the question still applies.

[Benjamin Poulain]

Created attachment 281878 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 281878 [details]
Patch

Clearing flags on attachment: 281878

Committed r202358: <http://trac.webkit.org/changeset/202358>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.