In addition to layout and rendering, a browser engine enforces the security policy between documents, handles navigation through hyperlinks and data submitted through forms, and implements the Document Object Model (DOM) data structure exposed to page scripts.Įxecuting JavaScript (JS) code is a separate matter, however, as every major web browser uses a dedicated engine for this. In practice, however, they are tightly coupled and rarely considered separately. In theory, layout and rendering (or "painting") could be handled by separate engines. The word " engine" is an analogy to the engine of a car.īesides "browser engine", two other terms are in common use regarding related concepts: "layout engine" and "rendering engine". The primary job of a browser engine is to transform HTML documents and other resources of a web page into an interactive visual representation on a user's device.Ī browser engine is not a stand-alone computer program but a critical piece of a larger program, such as a web browser, from which the term is derived.
Not to be confused with JavaScript engine.Ī browser engine ( also known as a layout engine or rendering engine) is a core software component of every major web browser.
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