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While the dialogs all have a visual label, this isn’t communicated to an AT. It’s probably enough to set an aria-describedby on the dialog to point at what is used for the visual label. See:
https://www.w3.org/TR/wai-aria-1.1/#dialog
https://www.w3.org/TR/wai-aria-practices-1.1/examples/dialog-modal/dialog.html
The Share dialog still does not have a label. (see: share-dialog.png)
While the dialogs all have a visual label, this isn’t communicated to an AT. It’s probably enough to set an aria-describedby on the dialog to point at what is used for the visual label. See:
https://www.w3.org/TR/wai-aria-1.1/#dialog
https://www.w3.org/TR/wai-aria-practices-1.1/examples/dialog-modal/dialog.html