Example
<svg width="400px" height="400px" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<line x1="10" y1="10" x2="300" y2="10" stroke="red" stroke-width="10" stroke-dasharray="20,2,5,2"/>
</svg>
Result
Different examples of stroke-dasharray:
<svg width="200" height="200" viewBox="0 0 200 200" version="1.1" xmlns="http://www.w3.org/2000/svg">
<line stroke-dasharray="5, 5" x1="10" y1="10" x2="190" y2="10" />
<line stroke-dasharray="5, 10" x1="10" y1="30" x2="190" y2="30" />
<line stroke-dasharray="10, 5" x1="10" y1="50" x2="190" y2="50" />
<line stroke-dasharray="5, 1" x1="10" y1="70" x2="190" y2="70" />
<line stroke-dasharray="1, 5" x1="10" y1="90" x2="190" y2="90" />
<line stroke-dasharray="0.9" x1="10" y1="110" x2="190" y2="110" />
<line stroke-dasharray="15, 10, 5" x1="10" y1="130" x2="190" y2="130" />
<line stroke-dasharray="15, 10, 5, 10" x1="10" y1="150" x2="190" y2="150" />
<line stroke-dasharray="15, 10, 5, 10, 15" x1="10" y1="170" x2="190" y2="170" />
<line stroke-dasharray="5, 5, 1, 5" x1="10" y1="190" x2="190" y2="190" />
<style><![CDATA[
line{
stroke: red;
stroke-width: 2;
}
]]></style>
</svg>
Result:
