Last example on this page doesn't show up on WP7:
Confirmed as a bug in A4
Just re-tested in latest and these still don't show up.
Fixes #1230 — Looks like there was an extranious “text-indent: -9999p…
…x” set on the buttons themselves, which was causing IE to hide the icons (as they’re inline). Since it doesn’t look like text can possibly exist outside of .ui-btn-text, it should be safe to remove it.