Square using Polygon
<svg width="150" height="100" xmlns="http://www.w3.org/2000/svg">
<polygon points="50,0 100,0 100,50 50,50" style="fill:#2ABFB5;stroke-width:3" />
</svg>
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<svg width="150" height="100" xmlns="http://www.w3.org/2000/svg">
<polygon points="50,0 100,0 100,50 50,50" style="fill:#2ABFB5;stroke-width:3" />
</svg>