The browser identifies tokens from stylesheet and coverts them into nodes which are linked into a tree structure. The entire map of all the nodes with their associated styles of a page would be the CSS Object Model.
To display the webpage, a web browser takes following steps.
- The web browser examines your HTML and builds the DOM (Document Object Model).
- The web browser examines your CSS and builds the CSSOM (CSS Object Model).
- The web browser combines the DOM and the CSSOM to create a render tree. The web browser displays your webpage.