[gilrain]

Not really misleading: most screen readers aren't yet using the HTML5 Document Outline algorithm, so for accessibility you still have to rely on proper h1-6.

Ideally, you'd use them in combination for future proofing. It takes a little work, but you can arrive at the same general outline from both algorithms, since the new one ignores the ordinality of the h tag.

[steveax]

Screen readers will use whatever document outline that the browser renders, no?

[4lun]

In my experience many screen reader users aren't on the latest version of their accessibility software (cost and effort are among the reasons). So it's not uncommon for users to be using screen reader software that doesn't account for HTML5 elements.