<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

 <head>

  <title>CSS Reftest Reference</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" />

  <meta name="DC.date.created" content="2016-12-22T09:54:03+11:00" scheme="W3CDTF" />
  <meta name="DC.date.modified" content="2017-01-03T09:54:03+11:00" scheme="W3CDTF" />

  <meta content="" name="flags" />

  <style type="text/css"><![CDATA[
  html
    {
      writing-mode: vertical-lr;
    }

  body
    {
      font-size: 16px;
      line-height: 1.25; /* therefore, each line box is 20px tall */
    }

  p
    {
      left: 8px;
      position: absolute;
      writing-mode: horizontal-tb;
    }

  p#sentence-before
    {
      margin-top: 8px;
    }

  div
    {
      border: blue solid 35px;
      height: 50%;
      left: 8px;
      position: absolute;
      top: 52px;
    }

  p#sentence-after
    {
      top: calc(52px + 35px + 50vh + 35px);
      /*
      50vh means 50 vh unit where each vh is equal to
      1% of the height of the initial containing block.
      So 50vh == half of the height of initial containing block
      5.1.2. Viewport-percentage lengths: the vw, vh, vmin, vmax units
      https://www.w3.org/TR/css3-values/#vh
      */
    }
  ]]></style>
 </head>

 <body>

  <p id="sentence-before">Sentence before.</p>

  <div>01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00</div>

  <p id="sentence-after">Sentence after.</p>

 </body>
</html>