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DOMException

The DOMException interface represents an abnormal event (called an exception) which occurs as a result of calling a method or accessing a property of a web API. This is basically how error conditions are described in web APIs.
API DOM DOMException Error Error code Exception Reference

KeyboardEvent.code

The KeyboardEvent.code property represents a physical key on the keyboard (as opposed to the character generated by pressing the key). In other words, this property returns a value which isn't altered by keyboard layout or the state of the modifier keys.
API Code DOM Events KeyboardEvent Property Read-only Reference

Taking still photos with WebRTC

This article shows how to use WebRTC to access the camera on a computer or mobile phone with WebRTC support and take a photo with it. Try this sample, then read on to learn how it works.
Advanced API Example Sample code Video webcam WebRTC

StringView

As web applications become more and more powerful, adding features such as audio and video manipulation, access to raw data using WebSockets, and so forth, it has become clear that there are times when it would be helpful for JavaScript code to be able to quickly and easily manipulate raw binary data. In the past, this had to be simulated by treating the raw data as a string and using the charCodeAt() method to read the bytes from the data buffer.
Code snippet Guide JavaScript JavaScript typed arrays js-ctypes MDN JavaScript Libraries Sample code Typed Arrays WebGL WebSockets