Test 三角形

<svg viewBox="0 0 300 260" xmlns="http://www.w3.org/2000/svg" aria-label="三层三角形">

 <polygon points="150,0 0,260 300,260" fill="#E6F4FF" stroke="#BEE6FF" stroke-width="1"/>
 <line x1="100" y1="86.6667" x2="200" y2="86.6667" stroke="#FFFFFF" stroke-width="2" />
 <line x1="50"  y1="173.3333" x2="250" y2="173.3333" stroke="#FFFFFF" stroke-width="2" />
 <text x="150" y="43.333"  text-anchor="middle" dominant-baseline="middle" font-size="20" font-family="sans-serif" fill="#0b3b57">A</text>
 <text x="150" y="130"    text-anchor="middle" dominant-baseline="middle" font-size="20" font-family="sans-serif" fill="#0b3b57">B</text>
 <text x="150" y="216.666" text-anchor="middle" dominant-baseline="middle" font-size="20" font-family="sans-serif" fill="#0b3b57">C</text>

</svg>