One of the objections Jamie brought up to making aria-errormessage an
additional interface is that it increases the number of interfaces AT needs
to call on every single accessible. I've also thought about this same
issue, as the number of nodes in an average web page continues to grow
along with the number of interfaces in IA2.
What would folks think of adding some sort of bitmask to allow AT to
quickly test for the presence of lots of properties at the same time?
Something like:
HRESULT propertyBitmask([out, retval] IA2PropertyBitmask *bitmask)
enum IA2PropertyBitmask {
IA2_HAS_NAME = 0x01,
IA2_HAS_DESCRIPTION = 0x02,
IA2_HAS_ERRORMESSAGE = 0x04,
...
}
One could imagine variants of this, for example AT could fill in the
bitmask with properties it's interested in, and the browser would only have
to compute those.
- Dominic
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