Css faq (Personal accumulation summary)

Note:In the process of learning CSS, because it contains too many elements, attributes, and so on, there are always some places where you are not sure or often make mistakes.

Blog posts to record the error points and use them by yourself. I will also share it with you by the way.

Easy to mix attributes:
1.The none attribute of the display attribute can hide tags, and the none attribute of visibility can also hide tags.

Difference: the former is hidden and does not occupy the space at the original position. The latter is hidden but still occupies the space at the original position.