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chromium/third_party/blink/web_tests/svg/stroke/non-scaling-stroke-text-decoration.html 

<!DOCTYPE html>
<svg>
    <g transform="scale(2 2)">
       <text x="0" y="50" stroke="blue" stroke-width="2" fill="none" vector-effect="non-scaling-stroke" font-size="36" text-decoration="underline">Hello</text>
    </g>
</svg>