When writing HTML, writing FORM will cause the problem of multiple empty lines
In the past, Form was inserted into These methods between Table and tr (or between tr and td)
Solution: form{margin:0px;display: inline}
Instructions:
Margin: The upper, lower, left and right intervals are set to 0px
display: inline will be displayed on the same line
Reprinted from: http://www.jb51.net/css/24606.html