Run the Rich Content Editor Accessibility Checker automatically every time the Save button is checked.
How it should work
Each time the Save or Save and Publish button is checked, the Rich Content Editor Accessibility Checker should run and give the user an abbreviated report. If the check is clear the alert should clear automatically (similar to the way the course status alert disappears when a course is published or unpublished). If the check is not clear the alert should give the user a chance to ignore or run the complete report. One click is all that is needed.
Why we shouldn't wait
Although the Rich Content Editor Accessibility Checker is not yet perfect, which has been well documented on the Canvas Production Release Notes (2017-10-28), an idea like this one both increases awareness of universal design and provides another point where developers can get feedback from users on ways to improve that tool. In the future the tool will hopefully be able to generate class- and institution-wide reports, read embedded files, confirm that embedded videos are captioned, and otherwise check everything in the General Accessibility Design Guidelines document.
Big results require big ambitions.
How it benefits students
Pages that follow universal design principles benefit all users, not just those with disabilities. By encouraging faculty and designers to incorporate these principles as they work in Canvas, we might find out that teaching benefits too.