What is browser engine and how does it works?

A web browser is a software app for accessing information on the Internet. Each image, web-page, and video is identified by a distinct URL, enabling browsers to retrieve these resources from a web server and show them on a user's device.
When you choose a web-browser, you’re also choosing a rendering engine and a browser engine. 

Browser engine
The browser engine is the main software component in every major web browser. The primary purpose of the browser engine is to transform HTML documents and other web page resources into an interactive visual representation of the user's device. The engine combines all relevant CSS rules to calculate the exact graphical coordinates of the visual representation it will display on the screen. The engine makes the necessary system calls to complete the process.
The browser engine is to take HTML, CSS, and other web page code - text that you can see at the source of the page or open in a text editor, layout, page content and style - and transform it into what you see on the screen.

Because of the Web platform is a set of open standards, there are multiple browser engine implementations like Gecko, WebKit, Blink engine, Trident and EdgeHTML and Servo.
 
How does browser engine work?
In some ways, the engine is like a translator, turning unintelligible raw code into a beautifully arranged page of text and graphics.

The browser engine chooses how to interpret the web developer's facts about how certain lines of code affect what is displayed on the screen. The browser engine is the most important element of the browser. Browser engines are the main reason why web pages sometimes look, load and function differently in browsers. Along with existing web standards, browser engines need to support new standards as the Internet becomes more complicated.


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