ids that starts with a number

[AndreasMadsen]

As I understand it HTML5 does not set any restrictions on the ID (other than it is unique). Thus I can have an id like 2d and get the hash #/2d. In that case https://github.com/hakimel/reveal.js/blob/master/js/reveal.js#L3285-L3286 will cause it to be parsed as 2 moving, thus navigating to horizontal slide number two.

I don't know what the correct fix is. But it was confusing very when I had my 2d slides as hindex = 3 and when I pressed right it would navigate back to hindex = 2.

[deitch]

I just got bit by this. Putting together a slide on cloud architectures, wanted a slide on 12-Factor Apps, so I did:

<section id="12factor">
<!-- lots of content here -->
</section>

It wouldn't go to it, just jumped over and got stuck. Took me a while to figure out the problem was starting the ID with a number. It violates html4 per https://www.w3.org/TR/html4/types.html#type-id but since reveal.js is html5, where it is allowed to start with a number (or even be just numbers) per https://www.w3.org/TR/html5/dom.html#the-id-attribute it should work.