其实html没什么好补充的了，主要是使用css如何构造出各种想要的效果
1.加减框
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.inp{
border: 0;
border-left: 1px solid #dddddd;
border-right: 1px solid #dddddd;
height: 25px;
margin: 0;
padding: 0;
float: left;
}
.sp{
display: inline-block;
height: 25px;
width: 25px;
line-height: 25px;
text-align: center;
float: left;
}
</style>
</head>
<body>
<div style="border: 1px solid #dddddd;display: inline-block">
<div class="sp">-</div>
<input type="text" class="inp" />
<div class="sp">+</div>
</div>
</body>
</html>
2.小尖角
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.c1{
display: inline-block;
border-right: solid 15px red;
border-left: solid 15px transparent;
border-top: solid 15px yellow;
border-bottom: solid 15px black;
}
</style>
</head>
<body>
<div class="c1"></div>
</body>
</html>
3.伪类与常用后端模版样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
/*伪类清除漂浮*/
.clearfix:after{
content: '.';
clear: both;
display: block;
visibility: hidden;
height: 0;
}
body{
margin: 0;
}
.pg-header{
height: 50px;
background-color: aqua;
}
.pg-body .body-menu{
position: absolute;
top: 50px;
width: 200px;
left: 0;
bottom: 0;
background-color: red;
}
.pg-body .body-content{
position: absolute;
top: 50px;
left: 210px;;
right: 0;
bottom: 0;
background-color: yellow;
overflow: auto;
}
</style>
</head>
<body>
<div class="pg-header"></div>
<div class="pg-body">
<div class="body-menu"> </div>
<div class="body-content">
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</div>
</div>
<div class="pg-footer"></div>
</body>
</html>