javascript - Why is my SVG image blurry when using a fill pattern? -

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i have repeated image on page.
if add manually (via d3.js), image clear, if use image fill pattern blurry.
issue consistent on latest ie, ff, , chrome.

is there way make fill pattern same when manually add images?

blurry on top, clear on bottom

js fiddle here, , code included below.

svg code:

<svg>     <defs>          <symbol id="rack">         <rect height="50" width="50" rx="5" ry="5" fill="#c9cfd6"               stroke="#505356" stroke-width="3" />         <line x1="8"  y1="8" x2="36" y2="40" stroke="#505356" />         <line x1="36"  y1="8" x2="8" y2="40" stroke="#505356" />         </symbol>          <!-- using pattern looks blurry!!! -->         <pattern id="rack_pattern" patternunits="userspaceonuse"                   x="0" y="0" width="50" height="50">         <use xlink:href="#rack" />         </pattern>      </defs> </svg>

javascript:

// blurry using fill var svg = d3.select("body").style("background-color", "black")     .append("svg")     .attr("width", 900)     .attr("height", 500)     .attr("viewbox", "0 0 3700 500")  svg.append("rect")     .attr("x", 0)     .attr("y", 0)     .attr("height", 300)     .attr("width", 3500)     .attr("fill", "url(#rack_pattern)");   var data = []; (var r=0; r<7 ;r++) {     (var c=1; c<71; c++) {         data.push(             {                 x: 3500 - (c * 50),                 y: (r * 50) + 320              }         );     }; };  // clearer adding iteratively var clear_section = svg.selectall("use")     .data(data).enter()     .append("use")     .attr("xlink:href", "#rack")     .attr("x", function(d) { return d.x; })     .attr("y", function(d) { return d.y; });

the rect in symbol not 50 units wide 53 units wide (1/2 stroke pokes out on each edge) pattern subject rescaling. if change rect this

<rect height="47" width="47" rx="5" ry="5" fill="#c9cfd6" stroke="#505356" stroke-width="3" />

it becomes 50 units wide , pattern looks sharper there's no scaling.


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