SVG stroke width test
HTML
<svg id="svg1" width="100%" height="500">
<defs>
<linearGradient id="g1">
<stop stop-color="red" offset="0"></stop>
<stop stop-color="yellow" stop-opacity="0.2" offset="80%"></stop>
<stop stop-color="yellow" stop-opacity="0" offset="100%"></stop>
</linearGradient>
</defs>
<path id="path1" stroke-linecap="round" stroke-width="5" stroke="url(#g1)" fill="transparent" d="m78.5,167.5c48,-54 84,-58 184,-6c100,52 175,-8 174.5,-8.5" ></path>