Resolve a few more unknown's for Firefox 21/22

The relevant bugs are here:

`<ruby>`: https://bugzilla.mozilla.org/show_bug.cgi?id=33339
`input type=number`: https://bugzilla.mozilla.org/show_bug.cgi?id=344616
`<details>` and `<summary>`: https://bugzilla.mozilla.org/show_bug.cgi?id=591737
`input type=color`: https://bugzilla.mozilla.org/show_bug.cgi?id=547004
`input type=datetime`: https://bugzilla.mozilla.org/show_bug.cgi?id=825294