What is the difference between classe s and ID s in CSS?
Câu trả lời
In CSS, classes and IDs are both selectors used to apply styles to HTML elements, but they have different purposes and use cases.
Classes
General Purpose: Classes are used to define a style for a group of elements. They are not unique, meaning the same class can be applied to multiple elements within the same HTML document.
Syntax: In CSS, a class is denoted by a period (.) followed by the class name, for example, .classname.
Multiple Classes: An HTML element can have multiple classes, allowing it to inherit styles from various class definitions.
Case Sensitivity: Class names are case-sensitive.
Use Case: Classes are ideal when you want to apply the same style to several elements or when you want elements to share a common style base with the flexibility to add more specific styles through additional classes or other selectors.
IDs
Unique Identifier: An ID is a unique identifier for a single element in an HTML document. Each ID must be unique within the document.
Syntax: In CSS, an ID is denoted by a hash (#) followed by the ID name, for example, #idname.
Single Use: An ID should only be used once per page. It is meant to select a specific element when a unique style or a JavaScript interaction is required.
Specificity: IDs have a higher specificity compared to...
