describedMath alone should not be a flag for alternative text

[mattgarrish]

As we've discussed before, described math can apply to mathml equations, latex, etc. It's not a statement about the format of the math, so it shouldn't be a flag in the nonvisual reading for saying that alternative text is available for images unless it's paired with a mathOnVisual access mode.

[GeorgeKerscher]

Matt writes:
saying that alternative text is available for images unless it's paired with a mathOnVisual access
George:

1. Can we specify this out?
2. Is there any other case where described math works? Possibly if there is MathML and there is alttext attribute filled in?
   It seems that the images with alt text is the most common experience we will encounter.

[mattgarrish]

Described math isn't only about alt text attributes. You could use aria-details and give an extended description of an equation in a details element. That's why we already took the word "images" out of the string in the rich content description when it's present.

You need to check if accessMode=mathOnVisual is present and pair it with a check if describedMath is set if the descriptive string is going to say images are described.

The alternative is to do what we did in rich content and take "images" out of the descriptive statement so it only says: "Has alternative text descriptions".