Ability to select active element

[ryanzec]

It would be nice to have the ability to select the currently active element (like a focused input box). It would also be helpful if this functionality was available in the assertions codebase too so that it would be possible to test that an input box is properly auto focused on page load (which is common for login screen).

[asciidisco]

I consider adding a "shortcut" method for this, but for now the ":focus" selector might do the trick, I haven't tested it yet, but if you have a scenario handy where you could quickly check this & report the results, I would kindly ask you to check this for me ;)