What is the function of class tag in css

The class in css is not a tag, but a class selector, whose function is to specify the style of all elements of the class; before using the class selector, you need to modify the specific document tag so that the class selector can work properly ; and in order to associate the class selector's style with an element, class must be specified as an appropriate value.

The operating environment of this tutorial: Windows 10 system, CSS3 version, DELL G3 computer

What is the role of the class tag in css?

The class in css is not a label, but a class selector.

class is a class selector that allows styles to be specified in a way that is independent of document elements.

Before using the class selector, you need to modify the specific document markup so that the class selector can work properly.

In order to associate the style of a class selector with an element, class must be specified as an appropriate value. Please look at the following HTML code:

<h1 class="important"> This heading is very important. </h1> <p class="important"> This paragraph is very important. </p>

In the above code, the class of two elements is specified as important: the first title (h1 element), and the second paragraph (p element).

Related introduction:

The class value contains a word. In HTML, a class value may contain a list of words separated by spaces.

For example: If you want to mark a specific element as important and warning at the same time, you can write:

This paragraph is a very important warning .

The order of these two words does not matter, it can also be written as warning important.

Assume that all elements with a class of important are in bold, and all elements with a class of warning are in italics. All elements that contain both important and warning in the class also have a silver background.

can be written as: .important {font-weight:bold;} .warning {font-weight:italic;} .important.warning {background:silver;} by linking two class selectors together , only elements containing both of these class names can be selected (the order of the class names is not limited).

Recommended learning: "css video tutorial"

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