flex container
      (with various writing-modes on the flex items).
    </title>
    <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com"/>
    <link rel="help" href="http://www.w3.org/TR/css-flexbox-1/#layout-algorithm"/>
    <link rel="match" href="flexbox-basic-block-horiz-001-ref.xhtml"/>
    <style>
      div { height: 100px; }
      div.flexbox {
        border: 1px dashed blue;
        width: 200px;
        font-size: 10px;
        display: flex;
      }
      div.a {
       