Re: Proposal for "Cascading Attribute Sheets" - like CSS, but for attributes!

On Tue, Aug 21, 2012 at 1:58 PM, Tab Atkins Jr. <jackalmage@gmail.com>wrote:

> On Tue, Aug 21, 2012 at 1:42 PM, Ojan Vafai <ojan@chromium.org> wrote:
> > On Tue, Aug 21, 2012 at 1:01 PM, Tab Atkins Jr. <jackalmage@gmail.com>
> > wrote:
> >> On Tue, Aug 21, 2012 at 12:37 PM, Ojan Vafai <ojan@chromium.org> wrote:
> >> > Meh. I think this loses most of the "CSS is so much more convenient"
> >> > benefits. It's mainly the fact that you don't have to worry about
> >> > whether
> >> > the nodes exist yet that makes CSS more convenient.
> >>
> >> Note that this benefit is preserved.  Moving or inserting an element
> >> in the DOM should apply CAS to it.
> >>
> >> The only thing we're really losing in the dynamic-ness is that other
> >> types of mutations to the DOM don't change what CAS does, and some of
> >> the dynamic selectors like :hover don't do anything.
> >
> >
> > Ah, I missed the "plus a mutation observer that reruns the mutations on
> any
> > nodes added to the document" bit. Ok, so this timing is very specific
> then.
> > It would get applied at the microtask time, not at the time the DOM was
> > modified. Would it get applied before or after mutation observers get
> > called? Seems like you'd want it to execute first. Calling it after
> mutation
> > observers would require an extra delivery of mutations after the
> attributes
> > are applied, which seems silly.
>
> I presume there's an ordering of mutation observers, such that ones
> defined earlier in document history get the notifications first, or
> somesuch?


Correct.


>  If so, CAS should indeed run before any author-defined
> observers.


On a somewhat unrelated note, could we somehow also incorporate jquery
style live event handlers here? See previous www-dom discussion about this:
. I suppose we'd still just want listen/unlisten(selector, handler)
methods, but they'd get applied at the same time as cascaded attributes.
Although, we might want to apply those on attribute changes as well.