CS50 Notes

HTML

A markup language that defines the structure of a web page.

CSS

Stands for Cascading Style Sheet, used for styling web pages.

CSS Selectors

Patterns used to select elements for styling in CSS.

Element Type Selector

A CSS selector that targets elements by their type (e.g., h1, p).

ID Selector

A CSS selector that uses a hashtag (#) to target a unique element; no two elements can share the same ID.

Class Selector

A CSS selector that uses a period (.) to target elements; multiple elements can share the same class, and one element can belong to multiple classes.

Specificity Order

The hierarchy of CSS selectors that determines which styles are applied, in the order of Inline, ID, Class, and Type.

Inline Style

CSS styles applied directly within an HTML element's style attribute.

ID

A unique identifier for an HTML element, used with the ID selector in CSS.

Class

A grouping of HTML elements that can share styles, used with the class selector in CSS.