The unfocused/focused styling change makes sense. Many sites get it right but even today, so many get it wrong. (It gets to where you fill out a form and have no clue as to which field you are entering.)
Slight styling issue re: the toolbar:
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I realize it's a single(?)-pixel border beneath the Preview button but, when expanding a "More options..." toolbar, it looks as though Preview's background is off by a pixel.
I wasn't sure whether to post it as a bug or a suggestion, or if I should just alter the style myself.
Removing the left and bottom borders does clean it up somewhat:
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Or removing the borders and changing the background color subtly:
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