Selectors

The `idExp` and `classExp` tests caused `find()` to only delegate to `getElementById()` and `getElementsByClassName()` when *only* the id/className itself was provided (e.g. `'.myClass'`). It failed for e.g. `'.myClass div'` or `'#myId .deepClass'`, which should also be supported imho (by delegating to `querySelectorAll()`).

Fixed a bug in IE8 regarding `textContent || innerText`.