Accessible JavaScript patterns
summary
Live demos show a working accessible nav and modal with code on GitHub, not theory: keyboard handling implements arrow keys home end pageup pagedown plus Enter, Escape and letter jumps; menus open/focus first or last item and Tab closes; dialogs use focus-first focus-after-closed semantics, trap focus and remove event listeners on close. Concrete tools mentioned for validation are Lighthouse WAVE and Valley, and the examples behave interactively in the demos.
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