Consider camelCasing for markup languages

[charmarkk]

On behalf of metageeky (Kate Deibel) from Slack:

camelCase would [help] make clear the word boundaries so that they can identified more readily [and better read by screen readers]. I've worked with a lot of blind/low vision programmers (including students) and they face many barriers when learning.

[jnurthen]

This was particularly with respect to role names

[cookiecrook]

There's not a straightforward way (or a fool-proof way) to enforce camel-casing of content attributes, but the DOM properties are already camel-cased.

[scottaohara]

Related issue: w3c/html-aria#280.

[jnurthen]

lets close this unless someone wants to actively work on it