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CSS Property Value - 如何background-color: transparent;

background_color

【background_color】

我们想知道如何background-color: transparent;


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
div>div {
  background-color: cyan;
}

div  div:only-child {
  background-color: transparent;
}
</style>
</head>
<body>
  <div>
    <div class="e">e</div>
    <div class="f">f</div>
    <div class="f">g</div>
  </div>
  <div>
    <div class="e">e</div>
  </div>
  <div>
    <div class="f">f</div>
  </div>
</body>
</html>