It has been tested with Voice Over (mac) and with NVDA (windows).
When an added stamp annotation is focused, the screen reader will announce
that it's a figure containing a graphic with the added alt-text.
For the Firefox pdf viewer, we want to use AI to guess an alt-text when adding an image to a pdf.
For now the telemtry stuff is not implemented and will come soon.
In order to test it locally:
- set enableAltText, enableFakeMLManager and enableUpdatedAddImage to true.
or in Firefox:
- set browser.ml.enable, pdfjs.enableAltText and pdfjs.enableUpdatedAddImage to true.
