只要将图形设定只有边框就好
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"><head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
<style>
div{
height: 0px;
width: 0px;
border-top: 0px;
border-right: 100px solid white;
border-bottom: 100px solid gray;
border-left: 100px solid white;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
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