How does HTML select elements that contain both these class names

This article introduces the relevant knowledge of "how to choose the elements that contain these class names at the same time". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

By linking the two class selectors together, you can select only the elements that contain both these class names (in any order of class names).

If a multi-class selector contains a class name that is not in the list of class names, the match will fail. Take a look at the following rules:

.important.urgent {background:silver;}

As expected, this selector will only match p elements that contain the words important and urgent in the class attribute. Therefore, if there are only the words important and warning in the class attribute of a p element, there will be no match. However, it matches the following elements:

This paragraph is a very important and urgent warning.

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