Difference: 1. The scope of class is larger than that of id. ID is unique and can only be called once in a page, while class can be called multiple times; 2. ID corresponds to the style selector of CSS. is "#", and the style selector corresponding to class in CSS is "."; 3. The priority of the id selector is higher than the class selector.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
Comparison of class and id in Html:
1. The scope of effect is different:
class has a larger range than id, which represents a unique identifier, just like our personal ID card. It is unique and can only be called once on a page. Generally, a web page does not have two or more IDs. The scope of class is wider. Class is a class label and can be called multiple times in an interface. Can be reused.
2. The syntax used is different:
How the id selector is used in css, such as using div as an example: (For example, there are div respectively id='i'...
and div class='c'...
Two div boxes, the methods quoted in css are as follows:)
.c{ 属性:属性值; } #i{ 属性:属性值; }
3. Priority The levels are different:
The priority of the id selector is higher than the priority of the class selector. For more important ones, you can use the id selector.
Recommended tutorial: "html video tutorial"
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