What does this mean?

All dialogs (sometimes knows as 'pop up windows') should declare an accessible label that can be read out by screen readers.

To do this, use aria-label to specify a label, or aria-labelledby to point to the id of an element that contains text describing the modal, e.g.:

<div role="dialog" aria-labelledby="title">
    <div id="title">
        This is a dialog

The above example dialog has a label of This is a dialog.

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