Input text converts to nicely formatted SVG box

TextToSvg.js

    //FUNCTION
    //  This function attempts to create a new svg "text" element, chopping
    //  it up into "tspan" pieces, if the text is too long
    static textToSvg(caption, x, y) {

        //svg "text" element to hold smaller text lines
        var svgTextHolder = document.createElementNS('http://www.w3.org/2000/svg', 'text');
        svgTextHolder.setAttributeNS(null, 'x', x);
        svgTextHolder.setAttributeNS(null, 'y', y);
        svgTextHolder.setAttributeNS(null, 'font-size', 10);
        svgTextHolder.setAttributeNS(null, 'fill', '#FFF');
        svgTextHolder.setAttributeNS(null, 'text-anchor', 'left');

        //The following two variables can be passed as parameters
        var maximumCharsPerLine = 30;
        var lineHeight = 10;

        var words = caption.split(" ");
        var line = "";

        //process text and create rows
        var svgTSpan;
        var lineCount = 0; //number of lines to calculate height
        var tSpanTextNode;
        for (var n = 0; n < words.length; n++) {
            var testLine = line + words[n] + " ";
            if (testLine.length > maximumCharsPerLine) {
                //  Add a new <tspan> element
                svgTSpan = document.createElementNS('http://www.w3.org/2000/svg', 'tspan');
                svgTSpan.setAttributeNS(null, 'x', x);
                svgTSpan.setAttributeNS(null, 'y', y);

                tSpanTextNode = document.createTextNode(line);
                svgTSpan.appendChild(tSpanTextNode);
                svgTextHolder.appendChild(svgTSpan);

                line = words[n] + " ";
                y += lineHeight; //place next text row lower
                lineCount++; //count a line
            }
            else {
                line = testLine;
            }
        }

        //calculate final height in px, save global to be accessed later
        window.EventDescriptionTextHeight = lineCount * lineHeight;

        svgTSpan = document.createElementNS('http://www.w3.org/2000/svg', 'tspan');
        svgTSpan.setAttributeNS(null, 'x', x);
        svgTSpan.setAttributeNS(null, 'y', y);

        tSpanTextNode = document.createTextNode(line);
        svgTSpan.appendChild(tSpanTextNode);

        svgTextHolder.appendChild(svgTSpan);

        return svgTextHolder;
    }