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This article is about whether html can specify classes with any number of elements. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

You can specify a class for any number of elements. The class name important was previously applied to p and H2 elements, and it can be applied to more elements.

Difference 1: can only be used once in a document

Unlike classes, the ID selector is used once and only once in an HTML document.

Difference 2: cannot use ID word list

Unlike class selectors, ID selectors cannot be used together because the ID property does not allow a list of words separated by spaces.

Distinguishing 3:ID can have more meaning.

Similar to classes, ID can be selected independently of the element. In some cases, you know that a particular ID value will appear in the document, but you don't know which element it will appear on, so you want to declare a separate ID selector. For example, you might know that there will be an element with an ID value of mostImportant in a given document. You don't know whether the most important thing is a paragraph, a phrase, a list item, or a section heading. All you know is that every document has the most important content, which can be in any element, and there can only be one. In this case, you can write the following rules:

# mostImportant {color:red; background:yellow;}

This rule matches the following elements (these elements cannot appear in the same document at the same time, because they all have the same ID value):

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