Test 三角形
<html> <!doctype html> <meta charset="utf-8"> <svg viewBox="0 0 100 86.60254037844386"
style="display:block; width:200px; height:auto;"
xmlns="http://www.w3.org/2000/svg"
role="img" aria-label="等边三角形">
<polygon points="50,0 100,86.60254037844386 0,86.60254037844386"
fill="#3498db"/>
</svg> </html>