A browser's main components are
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- The user interface: this includes the address bar, back/forward button, bookmarking menu, etc. .
- The browser engine: this marshals actions between the user interface (UI) and the rendering engine.
- The rendering engine : responsible for displaying requested content. For example if the requested content is HTML, the rendering engine parses HTML and CSS, and displays the parsed content on the screen.
- Networking: for network calls such as HTTP requests, using different implementations for different platform behind a platform-independent interface.
- UI backend: used for drawing basic widgets like combo boxes and windows. This backend exposes a generic interface that is not platform specific. Underneath it uses operating system user interface methods.
- JavaScript interpreter. Used to parse and execute JavaScript code.
- Data storage. This is a persistence layer. The browser may need to save all sorts of data locally, such as cookies. Browsers also support storage mechanisms such as localStorage, IndexedDB, WebSQL and FileSystem.
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