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HTML

              
                <div>
  <div>
    <h1>Cistercian Numerals</h1>
    <label for="Number">Enter 1&ndash;9999:</label>
    <input type="number" max="9999" min="0" step="1" maxlength="4" id="Number" value="1984" onchange="updateGlyph(this.value,'CistercianGlyph');">
    <button type="button" onclick="updateGlyph(document.getElementById('Number').value,'CistercianGlyph');">Apply</button>
    <button type="button" onclick="countDown(document.getElementById('Number').value,'CistercianGlyph');">Countdown</button>
  </div>

  <div>
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 39.5 58.8" role="img" focusable="false" aria-labelledby="CistercianNumber" aria-describedby="CistercianDesc" id="CistercianGlyph" class="z1000 z900 z80 z4">
     <title id="CistercianNumber">1984</title>
     <desc id="CistercianDesc">A number as represented in Cistercian glyph</desc>
     <style>
      path{fill:none;stroke-width:2;stroke-linecap:round;stroke-miterlimit:10}
       .z1 .c1, .z2 .c2, .z3 .c3, .z4 .c4, .z5 .c5, .z6 .c6, .z7 .c7, .z8 .c8, .z9 .c9, .z10 .t1, .z20 .t2, .z30 .t3, .z40 .t4, .z50 .t5, .z60 .t6, .z70 .t7, .z80 .t8, .z90 .t9, .z100 .h1, .z200 .h2, .z300 .h3, .z400 .h4, .z500 .h5, .z600 .h6, .z700 .h7, .z800 .h8, .z900 .h9, .z1000 .d1, .z2000 .d2, .z3000 .d3, .z4000 .d4, .z5000 .d5, .z6000 .d6, .z7000 .d7, .z8000 .d8, .z9000 .d9 {
         stroke: currentColor;
       }
     </style>
     <path stroke="currentColor" d="M19.8 1v56.8"></path>
     <g id="Zeds">
      <path class="c1 c5 c7 c9" d="M38.5 1H19.8"></path>
      <path class="c2 c8 c9" d="M19.8 20.4h18.7"></path>
      <path class="c3" d="M19.8 1l18.7 19.4"></path>
      <path class="c4 c5" d="M19.8 20.4L38.5 1"></path>
      <path class="c6 c7 c8 c9" d="M38.5 20.4V1"></path>
     </g>
     <g id="Tens">
      <path class="t1 t5 t7 t9" d="M19.8 1H1"></path>
      <path class="t2 t8 t9" d="M1 20.4h18.8"></path>
      <path class="t3" d="M19.8 1L1 20.4"></path>
      <path class="t4 t5" d="M19.8 20.4L1 1"></path>
      <path class="t6 t7 t8 t9" d="M1 1v19.4"></path>
     </g>
     <g id="Hundreds">
      <path class="h1 h5 h7 h9" d="M19.8 57.8h18.7"></path>
      <path class="h2 h8 h9" d="M38.5 38.4H19.8"></path>
      <path class="h3" d="M19.8 57.8l18.7-19.4"></path>
      <path class="h4 h5" d="M19.8 38.4l18.7 19.4"></path>
      <path class="h6 h7 h8 h9" d="M38.5 57.8V38.4"></path>
     </g>
     <g id="Thousands">
      <path class="d1 d5 d7 d9" d="M1 57.8h18.8"></path>
      <path class="d2 d8 d9" d="M19.8 38.4H1"></path>
      <path class="d3" d="M19.8 57.8L1 38.4"></path>
      <path class="d4 d5" d="M19.8 38.4L1 57.8"></path>
      <path class="d6 d7 d8 d9" d="M1 38.4v19.4"></path>
     </g>
    </svg>
    
  </div>
</div>

<h2>Notes</h2>

<ul>
  <li>All shapes are in the SVG.</li>
  <li>Uses classes to selectively apply stroke colors.</li>
  <li>Sets the SVG as an image with <code>role="img"</code>.</li>
  <li>Uses <code>&lt;title&gt;</code> with <code>aria-labelledby</code> to provide an accessible name.</li>
  <li>The <code>&lt;title&gt;</code> acts as a tool-tip in many browsers, whether or not I want it to.</li>
  <li>Uses <code>&lt;desc&gt;</code> with <code>aria-describedby</code> to provide an accessible description.</li>
  <li>Works in Windows High Contrast Mode.</li>
  <li>Uses <code>focusable="false"</code> to prevent IE tab stops.</li>
  <li>1 request, 7.8kb, 804 bytes from script.</li>
  <li>You can save the SVG for your own use and adjust the classes to make any number in the range that you want.</li>
  <li>I wrote a post with some background: <a href="https://adrianroselli.com/2021/02/cistercian-svg.html"><cite>Cistercian SVG</cite></a></li>
</ul>

<h2>References</h2>

<ul>
  <li><a href="https://en.wikipedia.org/wiki/Cistercian_numerals">Cistercian numerals</a> at Wikipedia.</li>
  <li>The <a href="https://twitter.com/MathematicsUCL/status/1356558846093914114">tweet from UCL Department of Mathematics</a>.</li>
  <li><a href="https://github.com/TiroTypeworks/Clairvo">Clairvo</a>, a proof of concept OpenType font.</li>
  <li>A <a href="https://mz8i.com/cistercian/">React-driven app</a> mutating an SVG (5 HTTP requests, 68kb, ~57kb from React).</li>
  <li>Another <a href="https://codepen.io/dawneraq/pen/eYdQgGw?editors=1010">React-driven SVG-morphing</a> effort at Codepen (7 HTTP requests, 89kb, ~40kb from React, ~40 from fonts).</li>
</ul>
              
            
!

CSS

              
                body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  line-height: 1.4;
}

h1 {
  line-height: 1;
  margin: 0 0 1em 0;
}

body > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  margin: 2em 0 0 0;
  max-width: 50em;
}

body > div > div {
  flex: 0 1 15em;
  margin: 0 0 2em 0;
}

body > div > div:first-child {
  padding: .5em 1em;
  border: .3em double currentColor;
}

label, button {
  display: block;
  margin: .25em 0;
}

button,
input {
  font: inherit;
  letter-spacing: inherit;
  word-spacing: inherit;
}

button {
  margin: .5em 0 1.5em 0;
}

input {
  width: 4em;
}

#CistercianGlyph {
  width: 15em;
}
              
            
!

JS

              
                function updateGlyph(strNum,svgID) {
  var theSVG = document.getElementById(svgID);
  intNum = Number(strNum);
  document.querySelector("#" + svgID + " title").innerHTML = intNum;
  theSVG.setAttribute("class", "");
  const x = strNum.padStart(4,"0");
  theSVG.classList.add("z" + x.split("")[0] + "000");
  theSVG.classList.add("z" + x.split("")[1] + "00");
  theSVG.classList.add("z" + x.split("")[2] + "0");
  theSVG.classList.add("z" + x.split("")[3]);
}

async function countDown(strNum,svgID) {
  intNum = Number(strNum);
  for (let i = intNum; i > 0; i--) {
    const x = i.toString();
    document.getElementById('Number').value = x;
    updateGlyph(x,svgID);
    await sleep(1000);
  }
}

function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}
              
            
!
999px

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