vertical-align
请问一下span1为什么会与底部对齐？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
body{margin:0;}
.box{
border:1px solid black;
}
.span1{
background:red;
font-size:50px;
}
.span2
{
background:blue;
font-size:20px;
}
.span3
{
background:yellow;
font-size:100px;
vertical-align:bottom;
}
</style>
</head>
<body>
<div class="box">
<span class="span1">xxh</span>
<span class="span2">x</span>
<span class="span3">xxh</span>
x
</div>
</body>
</html>
