css/css-contain/contain-size-select-elem-002.html

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <title>CSS Test: 'contain: size' on select objects should cause them to be sized as if they have no contents.</title>
  <link rel="author" title="Morgan Rae Reschenberg" href="mailto:mreschenberg@berkeley.edu">
  <link rel="help" href="https://drafts.csswg.org/css-contain/#containment-size">
  <link rel="match" href="contain-size-select-elem-002-ref.html">
  <style>
  select {
    contain: size;
    color: transparent;
  }
  .floatLBasic {
    float: left;
  }
  </style>
</head>
<body>
  <select>
    <option>CSS Test: A size-contained select with no specified size should size itself as if it had no contents.</option>
    <option>aaaaaa</option>
    <option>b</option>
    <option>c</option>
  </select>
  <br>

  <select class="floatLBasic">
    <option>CSS Test: A size-contained floated select with no specified size should size itself as if it had no contents.</option>
    <option>a</option>
    <option>b</option>
    <option>c</option>
  </select>
</body>
</html>