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

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

<button><div>Content</div></button>