<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Containment Test: Reference file</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<style>
div.fakeButton {
  display: inline-block;
  border: 5px solid green;
  padding: 0;
  margin-bottom: 2px;
  color: transparent;
  width: 0;
  height: 0px;
  /* Layout containment creates a stacking context, the following lines simuluate the same in the reference file. */
  position: relative;
  z-index: 1;
}
</style>

<p>This test passes if it has the same output as the reference. You see the word "before", a 10px green square aligned 2px above the text's baseline, and then the word "after".</p>
before<div class="fakeButton"></div>after