What is the difference between id and class in CSS?

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In CSS, both id and class are used as selectors to apply styles to HTML elements, but they have different purposes, rules, and levels of specificity.

1. Uniqueness:

• id is unique. It should be used to identify one single element on a page. No two elements should have the same id.

• class is reusable. Multiple elements can share the same class.

2. Syntax in CSS:

• id is targeted with a # symbol:

• class is targeted with a . (dot):

3. Specificity:

• id has a higher specificity than class. If both are applied to the same element, the style defined with id will override the style from class, unless overridden by !important.

4. Usage:

• Use id for elements that appear once per page, such as <header>, <footer>, or a unique section.

• Use class for styling groups of elements with shared styles, like buttons, cards, or form inputs.

Here, styles from both #main, .box, and .content can apply.

In short, id is for unique styling, while class is for reusable styles. Use id sparingly and prefer class for most styling needs to keep your CSS flexible and maintainable.

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