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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<?xml version="1.0" encoding="utf-8"?>
<svg width="100%" height="100%"  viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<g font-family="Arial" font-size="18">
    <text x="10" y="20" id="svgText"><tspan font-family="Arial" font-size="20px" afont-family="cursive" afont-style="italic">Test</tspan></text>
    <g id="container"/>
​
    <script type="text/javascript"><![CDATA[
        function highlightGlyph(text, index, color) {
            var extent = text.getExtentOfChar(index);
            var startLengthIndex = 1;
            var substringLength = text.getSubStringLength(startLengthIndex, index);
​
            // Highlight rect that we've selected using the extent information
            var rectElement = document.createElementNS("http://www.w3.org/2000/svg", "rect");
            rectElement.setAttribute("x", text.getExtentOfChar(startLengthIndex).x);
            rectElement.setAttribute("y", extent.y);
            rectElement.setAttribute("width", substringLength);
            rectElement.setAttribute("height", extent.height);
            rectElement.setAttribute("fill-opacity", "0.4");
            rectElement.setAttribute("fill", color);
            document.getElementById("container").appendChild(rectElement);
        }
​
        var colors = [ "red", "orange", "yellow", "green", "blue", "indigo", "violet"];
​
        // Highlight each glyph with a semi-transparent rectangle and
        // a number corresponding to the queried character index.
        var textElements = document.querySelectorAll("text");
        for (var elemNum = 0; elemNum < textElements.length; ++elemNum) {
          var text = textElements[elemNum];
          var charCount = text.getNumberOfChars();
          for (var index = 0; index < charCount; ++index)
            highlightGlyph(text, index, colors[index % colors.length]);
        }
    ]]></script>
</g>
</svg>
​
</body>
</html>
 
​
Output

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