Color contrastText and UI that fails WCAG contrast ratios and is hard to read.
Alt textImages missing alternative text for screen-reader users.
Keyboard accessInteractive elements you can't reach or operate without a mouse.
ARIA & rolesMisused or missing ARIA that breaks assistive technology.
Form labelsInputs with no associated label, unusable with a screen reader.
Heading structureSkipped or out-of-order headings that break navigation.
Focus orderFocus that jumps around or gets trapped.
Link & button namesControls with no accessible name (“click here”, icon-only).