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CSS Property Value - 如何"border:none"或"border:0"

border 【border】
我们想知道如何"border:none"或"border:0"。
代码展示 运行结果 

<html>
<head>
<style>
div {
  border: 1px solid black;
  margin: 1em;
}

.zerotest div {
  border: 0;
}

.nonetest div {
  border: none;
}

div.setwidth {
  border-width: 3px;
}

div.setstyle {
  border-style: dashed;
}
</style>
</head>
<body>

  <div class="zerotest">
    <div class="setwidth">"Border: 0" and "border-width: 3px"</div>
    <div class="setstyle">"Border: 0" and "border-style: dashed"</div>
  </div>

  <div class="nonetest">
    <div class="setwidth">"Border: none" and "border-width: 3px"</div>
    <div class="setstyle">"Border: none" and "border-style: dashed"
    </div>
  </div>

</body>
</html>