docs: function zoomExplanation(divId, svg, text, visibility, pos) {
      d3.select(divId + " svg")
        .insert("text")
        .attr("transform", "translate("+(parseInt(svg.attr("width"))-pos)+", "+parseInt(svg.attr("height")-5)+")")
        .attr("class", "timeline-label")
        .text("")
        .attr("id", "timelineZoomExplanation")
        .text(text)
        .style("visibility", visibility);
    }