inline style stroke-width for axis makes bold tick labels

Question

I do not use css since I want to save and process the created SVG visualisation files. This means I need to use inline styles. So far I experienced d3 as flawless so most likely I did do something wrong.

I am expecting {'stroke-width': '3px'} to make thick axis lines. But it makes bold axis labels. I expected the text to be controlled with font related styles like {'font-style': 'normal'}.

Whats wrong with how I use 'stroke-width'? I tested this in both Chrome and Firefox.

here is my code:

<script>
    var margin = {top: 20, right: 10, bottom: 20, left: 40};
    var width = 960 - margin.left - margin.right;
    var height = 100 - margin.top - margin.bottom;

    var x = d3.scale.linear().range([0, width]);
    var y = d3.scale.linear().range([0, height]);
    var xAxis = d3.svg.axis().scale(x).orient("bottom");
          // .tickFormat(d3.time.format("%H:%M"));
    var yAxis = d3.svg.axis().scale(y).orient("left").ticks(height/10);

    var svg = d3.select("svg");
    var vis = svg.append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
        .style({'font-size': '10px', 'font-family': 'sans-serif',
            'font-style': 'normal', 'font-variant': 'normal', 
            'font-weight': 'normal'});

    var redraw = function(selection, data, style) {
        selection.selectAll(".bar")
            .data(data)
          .enter().append("rect")
            .attr('class', "bar")
            .attr("x", function(d) { return x(d[0]) - .5; })
            .attr("y", function(d) { return y(d[1]); })
            .attr("width", 5)
            .attr("height", function(d) { return height - y(d[1]);  })
            .style(style);

        vis.select(".x.axis").call(xAxis);
        vis.select(".y.axis").call(yAxis);
    };

    svg.attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom);

    vis.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .style({ 'stroke': 'Black', 'fill': 'none', 'stroke-width': '3px'})
      .call(xAxis);

    vis.append("g")
      .attr("class", "y axis")
      .style({ 'stroke': 'Black', 'fill': 'none', 'stroke-width': '3px'})
      .call(yAxis);

    // now we draw the first barchart (we do not know about the 2nd one yet)
    var data1 = [[2,0.5], [4,0.8], [6,0.6], [8,0.7], [12,0.8]];
    x.domain([0, 13]);
    y.domain([0.9, 0]);

    vis.append("g")
      .attr("class", "bar1");

    vis.select(".bar1")
      .call(redraw, data1, {'fill': 'Red', 'stroke': 'Black'});
</script>

Answer 1

I built on the answer of explunit and applied the stroke-width more selectively. Here is what I ended up with:

 vis.selectAll('.axis line, .axis path')
     .style({'stroke': 'Black', 'fill': 'none', 'stroke-width': '3px'});