The Translator and Language Detector APIs provide functionality to detect the language that text is written in, and to translate text into different languages, via a browser's own internal AI model (which may differ between browsers).

This article explains how to create fully-customized <select> elements using experimental browser features. This includes having full control over styling the select button, drop-down picker, arrow icon, current selection checkmark, and each individual <option> element.
The FileSystemObserver interface of the File System API provides a mechanism to observe changes to the user-observable file system and the Origin Private File System (OPFS). This means web applications don't have to poll the file system to find changes in the files or folder structure, which can be time-consuming and wasteful.
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WebAssembly JavaScript builtins are Wasm equivalents of JavaScript operations that provide a way to use JavaScript features inside Wasm modules without having to import JavaScript glue code to provide a bridge between JavaScript and WebAssembly values and calling conventions.