SVG/Canvas doesn't display pattern when provided as an argument for stroke. Instead, default black color fill is applied.

Sample HTML content:
<svg>
    <pattern id="pattern" width="10%" height="10%">
        <rect x="0" y="0" width="5" height="5" fill="green" />
    </pattern>

    <rect x="10" y="10" width="100" height="100" fill="none"
          stroke-width="20" stroke="url(#pattern)" />
</svg>