RE: tooltip onfocus

> It is in a W3C Recommendation (i.e. it's a W3C standard) that if they
> have a tooltip on mouseover they need to have a tooltip when you key
> there.
>
> Sound on event, in contrast, cannot be done with a W3C standard in HTML
> (but can in SMIL - HTML is a simple language for documents, and isn't
> expected to cover everything. The point of developing XML languages
> like SMIL, SVG, XHTML+SVG+MathML, etc, is to allow more powerful
> functionality like this...)

<blockquote
cite="http://www.w3.org/TR/html401/struct/global.html#adef-title">
<p>
Values of the title attribute may be rendered by user agents in a variety of
ways. For instance, visual browsers frequently display the title as a "tool
tip" (a short message that appears when the pointing device pauses over an
object). Audio user agents may speak the title information in a similar
context. For example, setting the attribute on a link allows user agents
(visual and non-visual) to tell users about the nature of the linked
resource:
</p>
</blockquote>

tooltip on key is certain contained within "Values of the title attribute
may be rendered by user agents in a variety of ways." and sound on event is
explicitly given as an example.