What is the reason for a lot of white space at the bottom of the html page?

Foreword:

I accidentally discovered that a large blank area appeared at the bottom of the html page, so the following analysis process was carried out.

The problem is as shown in the picture below:

After reviewing the code, the height of the body is not that high, indicating that it is an html problem

Solution:

Add the following code to ccs

html{
height:100%;
}

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