WCAG contrast requirements, tools for checking ratios, dark mode considerations, and handling text over images for readability.

Keyboard interaction patterns, focus trapping, focus restoration, and modern event.key usage for accessible custom widgets.

Using CSS to visually detect accessibility issues like missing alt text, empty links, improper heading order, and missing ARIA labels during development.

Replacing device-dependent event handlers with accessible alternatives to ensure keyboard, touch, and pointer compatibility.

Managing focus after route changes in single-page applications to ensure screen reader users know when content has updated.

Using HTML5 landmark elements and ARIA roles to create navigable page regions for screen reader users.