WebAIM - Web Accessibility In Mind

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Re: what roles will make a pop up dialog work

for

From: Bryan Garaventa
Date: Oct 9, 2014 12:21PM

That's right, in the same way that aria-expanded='false' and aria-pressed='false' and aria-checked='false' impart specific
functionality that is not included when the attribute is undefined by not being present.

Developers should never include ARIA attributes within markup even if set to 'false' unless there is a specific purpose to do so,
because the inclusion of the state/property may unexpectedly alter the feedback for AT users simply by being present.