Reviewing for accessibility
Public information has to be usable by everybody, and the fix is nearly always cheap when it is found early.
Check
Headings in real hierarchy, not visual formatting · alternative text that conveys the meaning rather than describing the picture · contrast against the ratio, with the measured value reported · link text that makes sense alone — never "click here" · tables with real headers, and no layout tables · forms with associated labels · language attribute set · no meaning carried by colour alone · video with captions and audio with a transcript.
Report with the fix
"Contrast 3.1:1 against a 4.5:1 requirement — darken to #4A4A4A" is actionable. "Poor contrast" produces another round.
Prioritise by exclusion
Order by who is shut out entirely, not by count. One unlabelled form field on the application page outranks twenty decorative images missing alt text.
Never
Pass a document because it looks fine, or treat a PDF as accessible because it opens.