Throughout Moodle image tags are used for a number of purposes:
- To indicate "required" or "advanced" elements.
- To indicate content type in lists.
- To show a clickable help icon.
Why it matters
Screen readers deal with these relatively well, typically reading the content of the ALT attribute. Still, they preface this text with the word "graphic," which is clutter.
All information should be conveyed in plain text. Icons should be displayed using CSS instead of image tags.