Development
SC 2.1.1 - What does "Keyboard" mean?
Put your mouse in a drawer and try to use your own website. Order something, submit the contact form, open the menu, close the cookie banner. Most teams get about a minute in before something stops working.
SC 4.1.2 - What does "Name, Role, Value" mean?
A screen reader user reaches a control on your page. Three things have to be true for them to use it. They have to know what it is (a button, a checkbox, a tab), what it is called (“Add to basket”), and what state it is in (pressed, expanded, checked). Success criterion 4.1.2 is the rule that guarantees all three: every interactive element exposes a name, a role and, where relevant, a value or state.
SC 4.1.3 - What does "Status Messages" mean?
You add something to your basket. The little number next to the cart icon goes from 2 to 3. Nothing else happens: no page reload, no focus change, no confirmation you have to dismiss.