CSS Overview: Selectors, Integration, Inheritance, Cascading


To understand CSS, you have to understand the DOM (Document Object Model). A rendering engine creates the DOM by parsing your HTML source code, so the two are definitely related, but they are not the same thing. As Mozilla Developer Network puts it:

The DOM is a fully object-oriented representation of the web page, and it can be modified with a scripting language such as JavaScript.

Ultimately, all DOM objects are boxes, so when you’re working with CSS, you are manipulating boxes in the DOM that were generated from your HTML.

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