rem: span.style.width = this.translateToPx(range.end - range.start); 
add: span.style.width = this.translateToPx(range.end - range.start + this.range.start); 
context:   setSpan: function(span, range) {    if(this.isVertical()) {      span.style.top = this.translateToPx(range.start);      span.style.height = this.translateToPx(range.end - range.start);    } else {      span.style.left = this.translateToPx(range.start);      span.style.width = this.translateToPx(range.end - range.start);    }  },
meta: 7994	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7994/494190d4567c6410e04682bd371a0b38a21919b5/slider.js/clean/src/slider.js