Principle 2 Operable · Guideline 2.1: Keyboard Accessible
2.1.2 No Keyboard Trap
Keyboard focus must never get stuck.
What this means in practice
A player or dialog that Tab cannot leave makes the page unusable – the only way out is closing the browser. Dialogs should trap focus but release it on Escape.
Normative wording
The binding text lives at the W3C. What you read here is our own faithful rendering – not a quotation.