前端是什么？ HTML HTML简介 HTML文档结构1 <!DOCTYPE HTML> 2 <html> 3 <head>...</head> 4 <body>...</body> 5 </html>
<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><title>Title</title><style>.hide{display: none;}.menu{height: 38px;background-color: #eeeeee;line-height: 38px;}.active{background-color: brown;}.menu .menu-item{float: left;border-right: 1px solid red;padding: 0 5px;cursor: pointer;}.content{min-height: 100px;border: 1px solid #eeeeee;}</style> </head> <body><div style="width: 700px;mar...