Alt-text of local image

It seems that alt text of a local image won't be rendered onto HTML when this image is loadable. This means alt text information is complelely lost when transformed. Is it a bug or feature? In fact, I'm developing a plugin and want to store some information as alt text. It would be better if alt-text is not ignored.

See this issue:


It looks like it is rendered into HTML:

Note that alt text is used by screen readers (in addition to being displayed when an image can't be loaded).

The W3C provides an explanation for when/how to use alt text.

Edit: Sorry for the late (and perhaps now out-of-context) reply! I didn't notice that the last post was 7-ish months ago!