svg

官方文档

marker元素定义了在特定的元素、元素、元素或者元素上绘制的箭头或者多边标记图形。

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<svg width="120" height="120" viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg" version="1.1">

<defs>
<marker id="Triangle" viewBox="0 0 10 10" refX="1" refY="5" markerWidth="6" markerHeight="6" orient="auto">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>

<polyline points="10,90 50,80 90,20" fill="none" stroke="black" stroke-width="2" marker-end="url(#Triangle)" />
</svg>