ID selector pound sign prefix followed by the ID name.
Id attribute defined in the tag, then the attribute value is set inside the ID name.
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <link rel="stylesheet" type="text/css" href="../css/index.css" /> </head> <body> <div id="IDxuanzeqi"> </div> </body> </html>
The following is written in CSS style file index.css
#IDxuanzeqi{ width:100px; height:100px; background-color；red; }
2019-08-24 10:18:43