转载：Line width in raphaeljs

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Is it real to make line with 1px weight in SVG or raphaeljs?

The follow code

var p = Paper.path("M1 1 L50 1");

p.attr("stroke", "#D7D7D7");

p.attr("stroke-width", "1");

p.attr("opacity", 0.5);

draw line which looks like 2px or 3px. Any alternative?