unit-vh-vw-overflow-scroll-ref-iframe.html

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<style>

  body { overflow: scroll }

  div {

    width: 10px;

    height: 10px;

    background-color: #d64203;

</style>

<body>

  <div id="a"></div>

  <div id="b"></div>

  <div id="c"></div>

  <div id="d"></div>

  <!--

  Ensure that the scroller positioned the same way as it would be in the

  'overflow: auto' case. We'll have scrollbars either way, but we don't

  want the '!=' reftest to spuriously succeed because of the scrollers.

-->

  <div style="width: 500px; height: 500px; background-color: black">

</body>

<script>

  // client{Width, Height} consist of the area _inside_ the scrollbars, so these

  // manually calculated units reflect the fact that with 'overflow: scroll' set,

  // viewport units are sized taking the scrollbars into account.

  var vw = 0.01 * document.body.clientWidth;

  var vh = 0.01 * document.body.clientHeight;

  var vmin = Math.min(vw, vh);

  var vmax = Math.max(vw, vh);

  document.getElementById('a').style.width = (50 * vw) + "px";

  document.getElementById('b').style.height = (25 * vh) + "px";

  document.getElementById('c').style.width = (35 * vmin) + "px";

  document.getElementById('d').style.height = (25 * vmax) + "px";

</script>