devtools/client/shared/test/browser_layoutHelpers.html


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<!doctype html>
<meta charset=utf-8>
<title> Layout Helpers </title>

<style>
  html {
    height: 300%;
    width: 300%;
  }
  div#some {
    position: absolute;
    background: black;
    width: 2px;
    height: 2px;
  }
  iframe {
    position: absolute;
    width: 40px;
    height: 40px;
    border: 0;
  }
</style>

<div id=some></div>