src title alt width height border
target跳转方式"_blank" "_self"
<ol type="1" start""
<ul type= "disc circle square"> type=none
cellpadding内边框 cellspacing外边框 bordercolor边框颜色 bgcolor背景颜色 backgound插入图片
valign top middle bottom（上中下）rowspan合并行 colspan合并列
table>tr>td
<form name="" method="get" action="">
username:<input type="text" name="username" value="请输入用户名" maxlength="10" size="30">
password:<input type="text" name="password" >
<input type="submit" value="登录"/>
nput type="radio" name="" value="" checked=“checked”
input type="checkbox" name="" value="" disabled="disabled"达到条件后显示
<select name="">
<option></option>