accessible-html

Accessible markup is not a pass you make later. It is how you write the markup the first time. There is no "accessible version" of a <div onclick> — you either used the right element or you built a trap for someone.

One rule above all: use the native HTML element that already does the job. Native elements ship focus, keyboard handling, state, and a role for free. Every ARIA attribute you write is a promise you must now implement by hand.

Target WCAG 2.2 Level AA unless told otherwise. That is the normal legal and contractual bar.

Non-negotiables (every file, every time)