What is the function of css selector

CSS selectors select HTML elements for styling, including selecting elements based on type, class, ID, or descendant relationships. The selector starts with the { symbol, followed by the selector type and optional qualifier, and ends with the } symbol, for example: p { color: red;}, which sets the text color of all

elements to red.

The role of CSS selector

CSS selector is used in CSS language to select HTML elements or their children The syntax of the element. It allows developers to describe the appearance and behavior of specific elements in a web page in a style sheet (CSS file).

Types of selectors

There are various types of selectors in CSS, including:

• Universal selectors ( * ): Select all elements in the page.
• Type selector (div): Selects elements with the specified tag name.
• Class selector (.myClass): Selects elements with the specified class name.
• ID selector ( #myId ): Selects elements with the specified ID.
• Descendant selector (div span): Select elements inside the specified ancestor element.
• Child element selector (div > span): The selection is the element that specifies the direct child element of the parent element.
• Adjacent element selector (div span): Select the element immediately following the specified element.

Using selectors

The selector starts with the symbol {, followed by the selector type and optional qualifier, and then with the symbol } Finish. For example:

p {
  color: red;
}

This rule selects all <p></p> elements in the page and sets their text color to red.

The role of selectors

CSS selectors play a vital role in web design because they enable developers to:

• Select specific HTML elements for styling.
• Select elements based on their type, class, ID, or other attributes.
• Create complex selectors for advanced layout and styling effects.
• Apply styles to specific page elements or their child elements.
• Use pseudo-classes and pseudo-elements to further enhance element selection and styling.

The above is the detailed content of What is the function of css selector. For more information, please follow other related articles on the PHP Chinese website!