是否可以仅在笔划的一端添加线帽？不是两端都像下面示例中显示的默认值一样。
<?xml version="1.0"?>
<svg width="120" height="120" viewBox="0 0 120 120" version="1.1" xmlns="http://www.w3.org/2000/svg">
<line stroke-linecap="butt"
x1="30" y1="30" x2="30" y2="90"
stroke="teal" stroke-width="20"/>
<line stroke-linecap="round"
x1="60" y1="30" x2="60" y2="90"
stroke="teal" stroke-width="20"/>
<path d="M30,30 L30,90 M60,30 L60,90 M90,30 L90,90"
stroke="white" />
</svg>