layout.html
<table> <!-- no white space at the beginning is important -->
<tr>
<td> <!-- important that the yield is contained in an element -->
<yield content_for="left" /> <!-- important to close this -->
</td>
<td>
<yield content_for="right" />
</td>
</tr>
</table>
main.html
<ng-layout src="layout.html">
<div content_for="left">
Hello
</div>
<div content_for="right">
{{ name }}
</div>
</ng-layout>