A little tip about masking a stroke like PointC is doing. If you notice your masks are being clipped or aren't showing up, try specifying the units like this. <mask id="mask" maskUnits="userSpaceOnUse"> <path class="mask-path" d="M100,250 500,250" /> </mask> In this demo you can't see the vertical and horizontal lines. And in some browsers like Firefox and IE/Edge, the curved path is being clipped 20px on the top and bottom. See the Pen 394dfe1ade2c3a5
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