
The Fullscreen API lets you display a specific element (and its descendants) in true fullscreen and then return to windowed mode. Learn the key methods, state checks, events, permissions considerations, and UX best practices for building focused video, game, and presentation experiences.

A practical introduction to the File and Directory Entries API—what it does, how it enables folder-aware uploads via drag-and-drop or directory pickers, and why it matters for importing structured user-provided data on the web.
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