Alt text for iframe images

[Sean Fitzpatrick]

Cross-posting from pretext-dev:

I've got <description> implemented for <asymptote>. (That is, the 'info' button containing the long description. This has been implemented for latex-image but not asymptote.)

But I would like to know what others think about what to do with <shortdescription>.

For latex-image, this supplies the content of the 'alt' attribute on the image element in HTML.

But 3D Asymptote images (which are WebGL .html files) are loaded in an iframe.

I still need to check on what happens to shortdescription for 2D asymptote.

Reading a few articles online suggests that "title" is recommended for accessibility on iframes, but it seems possible to include alt text.

What is the better approach?

1. <iframe title="(contents of <shortdescription>)" ... other attributes></iframe>

2. <iframe (attributes)> contents of <shortdescription></iframe>

3. Something else?

[Sean Fitzpatrick]

I decided to put the contents of the short description into the title attribute.

I think this gets read by screen readers.

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