<!DOCTYPE html>
<svg>
<defs>
<pattern id="a" width="10" height="10" patternUnits="userSpaceOnUse">
<rect width="10" height="10" fill="url(#a) blue"/>
</pattern>
<pattern id="b" width="10" height="10" patternUnits="userSpaceOnUse">
<rect width="10" height="10" fill="url(#b) lightblue"/>
</pattern>
</defs>
<rect width="80" height="80" x="10" y="10"
stroke="url(#a) green" fill="url(#b) green" stroke-width="20"/>
</svg>