[FIX] web: make focus tests works if window has not the focus

Until now, those tests failed if the window did not have the focus. We
solve the issue with 2 different fixes:
* instead of checking that the focus property is set, we can check the
activeElement instead, it seems to work.
* instead of calling the focus method, in some tests, we can trigger a
* 'focusin' event.  I don't know why this works, but it does.

Note that this might make the tests work in phantomjs

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