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chromium/third_party/blink/web_tests/fast/sub-pixel/sub-pixel-border-2.html 

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Test rendering of sub-pixel borders</title>
    <style>
      .test {
        box-sizing: content-box;
        display: inline-block;
        margin: 5px;
        width: 80px;
        height: 80px;
        border: 1px solid green;
        background: lightgreen;
        vertical-align: top;
        text-align: center;
        line-height: 80px;
      }
    </style>
  </head>

  <body>
    <div class="test" style="border-width: 0.25px">&nbsp;</div>
    <div class="test" style="border-width: 0.5px">&nbsp;</div>
    <div class="test" style="border-width: 0.75px">&nbsp;</div>

    <br>

    <div class="test" style="border-width: 1px">&nbsp;</div>
    <div class="test" style="border-width: 1.25px">&nbsp;</div>
    <div class="test" style="border-width: 1.5px">&nbsp;</div>
    <div class="test" style="border-width: 1.75px">&nbsp;</div>

    <br>

    <div class="test" style="border-width: 2px">&nbsp;</div>
    <div class="test" style="border-width: 2.25px">&nbsp;</div>
    <div class="test" style="border-width: 2.5px">&nbsp;</div>
    <div class="test" style="border-width: 2.75px">&nbsp;</div>

    <br>

    <div class="test" style="border-width: 3px">&nbsp;</div>
    <div class="test" style="border-width: 3.25px">&nbsp;</div>
    <div class="test" style="border-width: 3.55px">&nbsp;</div>
    <div class="test" style="border-width: 3.75px">&nbsp;</div>

    <p>
      Border thickness should be rounded up
      when it is grater than 0px but less than 1px,
      and floored when it is greater than 1px.
    </p>
  </body>
</html>