代码示例:(标识:css_outline-width)
<!DOCTYPE html>
<html>
<head>
<style>
p.ex1 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: thin;
}

p.ex2 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: medium;
}

p.ex3 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: thick;
}

p.ex4 {
  border: 1px solid black;
  outline-style: solid;
  outline-color: red;
  outline-width: 4px;
}
</style>
</head>
<body>

<h1>outline-width 属性</h1>

<p class="ex1">细的轮廓。</p>
<p class="ex2">中等的轮廓。</p>
<p class="ex3">粗的轮廓。</p>
<p class="ex4">4 像素的粗轮廓。</p>

</body>
</html>
运行结果: