User:Eleanorg/annotation/How Web Browsers Work

notes

the parts of a browser

• UI

• search bar etc

• BROWSER ENGINE

• links UI to rendering engine

• RENDERING ENGINE

• Renders content by parsing HTML, constructing DOM tree and adding CSS to 'paint' each element in correct position
• Firefox's rendering engine is 'Gecko'; Chrome & Safari use Webkit, another open source rendering engine.
• Rendering engines try to speed up final display by painting initial content before all has rendered.
• Parsing HTML is more difficult than XML because of its 'soft' syntax

• Networking

• Gets the data with HTTP requests etc

• Data Persistence

• Stores cookies