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What is the difference between "id" and "class"?
id is the unique element identifier of the page, and class is the identifier of the first-class element of the page.
But the uniqueness of the id requires the developer to ensure it, and the browser does not check it
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
id is the unique element identifier of the page, and class is the identifier of the first-class element of the page.
But the uniqueness of the id requires the developer to ensure it, and the browser does not check it