spacing: 0; }
	td, th { padding: 0; }

	span { display: inline-block; vertical-align: bottom; }

	</style>
</head>
<body>

<table width="300" style="background: aqua"><tbody><tr><td>

  <div style="float:left; background:blue; width: 100px; height: 100px"></div>

  <table style="background: yellow"><tbody><tr><td>
    <span style="width: 250px; height: 50px; background: purple"></span>
  </td></tr></tbody></table>

</td></tr></tbody></table>



</body></html>