try adding offset to grabbers

Author: etpinard

src/components/rangeslider/draw.js

@@ -276,14 +276,17 @@ function setPixelRange(rangeSlider, gd, axisOpts, opts) {
         .attr('x', pixelMax)
         .attr('width', opts._width - pixelMax);
 
-    var xMin = clampHandle(pixelMin - hw2),
-        xMax = clampHandle(pixelMax - hw2);
+    // ..
+    var offset = 0.5;
+
+    var xMin = clampHandle(pixelMin - hw2 + offset),
+        xMax = clampHandle(pixelMax - hw2 + offset);
 
     rangeSlider.select('g.' + constants.grabberMinClassName)
-        .attr('transform', 'translate(' + xMin + ',0)');
+        .attr('transform', 'translate(' + xMin + ',' + offset + ')');
 
     rangeSlider.select('g.' + constants.grabberMaxClassName)
-        .attr('transform', 'translate(' + xMax + ',0)');
+        .attr('transform', 'translate(' + xMax + ',' + offset + ')');
 }
 
 function drawBg(rangeSlider, gd, axisOpts, opts) {