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aria-activedescendent="" - what problem does this cause? #179

@jnurthen

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@jnurthen

In a few of our frameworks aria-activedescendent is set to "" until the component takes focus. Once it gets focused then it gets set correctly to a valid idref.
I'm not sure from the spec whether an empty string is valid or not for aria-activedescendent, but I really don't think this causes an accessibility issue.
Any chance this error can be suppressed for aria-activedescendent unless the component actually has focus - when it of course needs to be valid.

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