What are the types of css selectors?

CSS selector type: Basic selector: Select based on element name, including element selector, class selector and ID selector. Modifier selectors: Refine the base selector scope to include descendant selectors, subselectors, adjacent selectors, and pseudo-class selectors. Attribute selector: Select based on element attribute value, including attribute existence selector, attribute value selector and partial matching attribute value selector. Combine selectors: Combine multiple selectors, including comma-separated selectors and group selectors.

CSS Selector Type

CSS selectors are used to specify HTML elements or groups of elements to apply styles to them . There are four main types of CSS selectors:

1. Basic selectors

Basic selectors select elements by name, including:

• Element selector: Select elements with specific HTML tags, such as <p></p>, <h1></h1>
• Class selector: Select elements with specific class attributes, such as .primary, .container
• ID selector: Select elements with a specific ID attribute, such as #main, #contact

2. Modifier selector

Modifier selectors are used to refine the selection range of the basic selector, including:

• Descendant selector (blank): Select elements that are descendants of the parent element, such as div p
• Child selector (>): Select elements that directly belong to the parent element, such as div > p
• Adjacent selector ( ): Select the element immediately adjacent to the previous element, such as p h1
• Pseudo-class selector (:hover, :active): Select elements in a specific state, such as when the mouse is hovering (:hover), or when activated (:active)

3. Attribute selector

Attribute selector selects elements according to their attribute values, including:

• Attribute existence selector ([ Attribute]): Select elements with specific attributes, such as [type]
• Attribute value selector ([attribute="value"]): Select elements with specific attribute values, such as [type="text"]
• Partial matching attribute value selector ([attribute~="value"]): Select elements whose attribute values ​​contain the specified substring, such as [type~="text"]

4. Combination selector

Combined selectors allow multiple selectors to be combined together, for example:

• Comma-separated selectors: Select elements that satisfy multiple selector conditions , such as p, h1
• Group selector (brackets): Group multiple selectors and apply the same group of styles, such as (p , h1) { ... }

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