LayoutTests/fast/forms/content-with-margins-inside-button-expected.html

<style>
  .inner {
    width:100px;
    border: 1px solid;
    margin-top: 100px;
    margin-bottom: 100px;
  }
  
  .outer { text-align:center; float: left; background-color: #cccccc; border:1px solid black; padding:0; font-family: Times; font-size:16px }
</style>

<div class="outer"><div class="inner">Content</div></button>