Screen Capture API.
The Screen Capture API is a W3C standard exposing `navigator.mediaDevices.getDisplayMedia()` — the browser asks the user which screen, window, or tab to share and returns a `MediaStream`. It is the foundation of every browser-based screen recorder.
Browser support
Chrome, Edge, Firefox, Safari (15.4+), Brave, Arc, Opera. Mobile browsers do not expose it.
Permission model
The user explicitly picks the surface to share each session. The page never has standing access. Screen choice cannot be programmatically defaulted.
Audio capture
`audio: true` in the options requests system audio (or tab audio in Chrome). Microphone capture is a separate `getUserMedia` call combined into the same stream.
Frequently asked
Can I record without user permission?
No. Each session requires an explicit prompt and user choice.
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