<svg width="467" height="462">
<rect x="80" y="60" width="250" height="250" rx="20"
style="fill:#ff0000; stroke:#000000;stroke-width:2px;" />
<rect x="140" y="120" width="250" height="250" rx="40"
style="fill:#0000ff; stroke:#000000; stroke-width:2px;
fill-opacity:0.7;" />
<rect x="140" y="120" width="250" height="250" rx="40"
style="fill:#00ff00; stroke:#0000cc; stroke-width:5px;
fill-opacity:1.0;" />
</svg>
…renders in the browser as this: