Created by: ffoodd
Small tweaks caught by Pa11y on Boosted. Mostly:
- ensuring having
main
andh1
on each page, - a few
input
missing a label, - some redundant
alt
onimg
inside a link, - contents not wrapped in a landmark.
I ignore some other errors since they're not applicable for such snippets IMHO (several banner roles instead of one, for example).
Non-whitespace diff: https://github.com/twbs/bootstrap/pull/33772/files?w=1