altText property

A description of the icon used for accessibility.

If unspecified, the default value Button is provided. As a best practice, you should set a helpful description for what the icon displays, and if applicable, what it does. For example, A user's account portrait, or Opens a new browser tab and navigates to the Google Chat developer documentation at https://developers.google.com/chat. If the icon is set in a Button, the altText appears as helper text when the user hovers over the button. However, if the button also sets text, the icon's altText is ignored.

Optional.