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+<!--
+ Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+ <title>Vector image without intrinsic dimensions with percentage stroke-width (proportional to the diagonal)</title>
+ <rect y="0" width="100%" height="50%" fill="lime"/>
+ <rect y="50%" width="100%" height="50%" fill="aqua"/>
+ <!--
+ A percent stroke-width is resolved with respect to:
+
+ d = sqrt(vh**2 + vw**2) / sqrt(2)
+
+ where vh/vw are the image viewport width/height. Because this image has no
+ intrinsic dimensions or ratio, it expands to fill the entire background
+ positioning area, so its width is 100px and its height is 700px. For those
+ carefully-chosen dimensions, d = 500px, so 10% of that creates a 50px-wide
+ rectangle, vertically centered and horizontally left-aligned in the image.
+ -->
+ <line x1="25%" y1="25%" x2="25%" y2="75%" stroke="fuchsia" stroke-width="10%"/>
+</svg>