svg-with-outline-ref.html

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<!doctype html>

<html>

<title>CSS outline (ref)</title>

<link rel="stylesheet" href="/fonts/ahem.css"/>

<style>

body { margin: 0; padding: 0; }

</style>

<svg height=500>

  <rect x="8" y="8" width="24" height="24" fill="blue"/>

  <rect x="10" y="10" width="20" height="20" fill="green"/>

  <rect x="7.5" y="47.5" width="25" height="25" fill="none" stroke="blue"/>

  <rect x="10" y="50" width="20" height="20" fill="green"/>

  <text id="text" font-family="Ahem" font-size="100px" x="10" y="200">X</text>

  <script>

    const floatBounds = text.getBBox();

    const bounds = {

      x : Math.round(floatBounds.x),

      y : Math.round(floatBounds.y),

      width : Math.round(floatBounds.width),

      height : Math.round(floatBounds.height)

};

    const outline = document.createElementNS("http://www.w3.org/2000/svg", "rect");

    outline.setAttribute("x", bounds.x - 1);

    outline.setAttribute("y", bounds.y - 1);

    outline.setAttribute("width", bounds.width + 2);

    outline.setAttribute("height", bounds.height + 2);

    outline.setAttribute("fill", "none");

    outline.setAttribute("stroke", "blue");

    outline.setAttribute("stroke-width", "2");

    text.parentNode.insertBefore(outline, text);

  </script>

</svg>