Accordion: Added focus ring on focused accordion item's label #25
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#9
When one of the accordion items obtain the focus, the user can navigate between accordion items by using the tab key. Now, a focus ring is shown around the label. Note that the focus ring is not shown when clicking on the label. I used the same technique already applied in the tabs component (see this PR).
Also, when the mouse pointer is over an expanded accordion-item label, the user receives feedback by showing a darker gray compared to the "expanded" state.