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fix(a11y): current time and duration display accessibility with Voice…
…Over (#5653) The desired behavior when navigating any of the TimeDisplay components (current time, duration, remaining time) with the arrow keys with a screen reader is for the singular parent div to receive focus, and the reader should announce the text of each child span in order, ex. "Current Time 0:17" and "Duration 1:10". This is how it works when using JAWS. However, with VoiceOver each individual child span element receives focus and the contents are announced separately. According to the ARIA spec (see [here](https://www.w3.org/TR/html-aam-1.0/#details-id-124) and [example 8](https://www.w3.org/TR/wai-aria-1.1/#presentation)), there is no implicit role for span elements, so the contents should be exposed but the elements themselves should be invisible to screen readers. In other words, <span> Sample Content </span> should be the same as <span role="presentation"> Sample Content </span>. But this is not the case with VoiceOver. As far as I can tell, the desired behavior is only achieved with VoiceOver if each child span is explicitly made presentational, either by assigning each of them the presentation role, or by assigning the parent div a role that makes its children presentational (although there doesn't seem to be a role whose semantics fit the purpose of that div) The first ARIA doc link above shows the Mac OS X Accessibility Protocol mapping for span elements is to the group role. I don't know enough about accessibility API mapping to confidently draw conclusions about root cause, but this seems like a possible explanation. Changes: * add role="presentation" to each of the two span elements inside TimeDisplay divs * add aria-hidden="true to the TimeDivider (tangential improvement) * fix inaccurate description of the TimeDisplay component (tangential improvement)
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