设置class属性值以"test"开头的所有元素的背景颜色 - 在线编辑器

<html>
<!DOCTYPE html>
<html>
<head>
  <style>
    [class^="test"] {
      background: #ffff00;
    }
  </style>
</head>
<body>

  <div class="first_test">The first div element.</div>
  <div class="second">The second div element.</div>
  <div class="test">The third div element.</div>
  <p class="test">This is some text in a paragraph.</p>

</body>
</html>
​x
 
<html>
<!DOCTYPE html>
<html>
<head>
  <style>
    [class^="test"] {
      background: #ffff00;
    }
  </style>
</head>
<body>
​
  <div class="first_test">The first div element.</div>
  <div class="second">The second div element.</div>
  <div class="test">The third div element.</div>
  <p class="test">This is some text in a paragraph.</p>
​
</body>
</html>