# Browser API
- Document API
- can create full blown page from API
- can pull/extract existing elements, or manupulate/add new elements in DOM
- XMLHttpRequest API
- Graphics API - canvas and openGL, webGL
- Audio and Video API
- Device API - Notification, vibration API
- Client side storage API
- How to do something reperatively (fixed time interval) in UI, countodwn timer etc.
setInterval
or CSS - Browser History API
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