<!DOCTYPE html>
<html>
  <head>
    <title>Border-after in horizontal-bt mode, non-visible overflow</title>
    <style>
      body { color:black; background:white; }
      #container {
        -webkit-writing-mode: horizontal-bt;
        overflow:hidden;
        block-size:100px;
        border-block-end:150px solid white;
        background:red;
      }
      #inner { block-size:200px; background:white; }
    </style>
    <script>
      if (window.testRunner)
        testRunner.dumpAsText();
    </script>
  </head>
  <body>
    <p>The word 'HEST' should be seen below, and there should be no red.</p>
    <div id="container">
      <div id="inner">HEST</div>
    </div>
    <script>
      if (window.testRunner) {
        var height = container.scrollHeight;
        document.body.innerHTML = height == 200 ? "PASS" : "FAIL - height was " + height;
      }
    </script>
  </body>
</html>