<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
  .piece {
    position: absolute;
    left: -8px;
    top: 0;
    width: 100px;
    height: 100px;
    border: solid;
  }
</style>
<div style="position:relative; margin:50px;">
  <div class="piece" style="top:-8px; border-width:8px 12px 0 8px;"></div>
  <div class="piece" style="margin-left:140px; border-width:0 12px 0 8px;"></div>
  <div class="piece" style="margin-left:280px; border-width:0 12px 12px 8px;"></div>
</div>
