Line
Layers compose: an <area> under a <line> under <points>. They share the plot's scales, and are drawn in document order.
Result
Source examples/line.svgn
<diagram padding="26">
<!-- Layers compose: an <area> under a <line> under <points>. They share the
plot's scales, and are drawn in document order. -->
<data name="traffic">
<record t="0" v="10"/>
<record t="1" v="25"/>
<record t="2" v="18"/>
<record t="3" v="40"/>
<record t="4" v="34"/>
<record t="5" v="56"/>
<record t="6" v="48"/>
</data>
<plot data="traffic" width="400" height="240">
<area x="t" y="v"/>
<line x="t" y="v"/>
<points x="t" y="v" r="3"/>
</plot>
</diagram>