How to use div id and div class

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Id and class are used in div, span, p tags, H2, h3, and other tags, and id and class are very commonly used in-tag attributes.

The above is common to see id and class in the div tag. "header" and "menu" are custom CSS names. (pay attention to CSS naming case, do not start with a number to name css)

I. explanation of the usage of id and class

1. Differences in use

Id is unique, and the same name can only be used once in a web page.

Classes named by class can be used countless times in a web page.

2. The difference in css

Id is a class that begins with the "#" pound sign in css code.

Class is used in css code as "." A class at the beginning of a lowercase period symbol.

What do you mean by id and class

Both id and class can be used within any tag in a web page. Generally, the more important parts and special boxes use id, while the small parts or small structures use class. Id calls the style selector named "#" pound sign in css, and class calls css with "." A style selector named by a period in lowercase.

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