website

5 files changed, 452 insertions, 39 deletions

diff --git a/docs/_scripts/serve.sh b/docs/_scripts/serve.sh
index ed795542a..203156643 100755
--- a/docs/_scripts/serve.sh
+++ b/docs/_scripts/serve.sh
@@ -3,7 +3,7 @@ set -e
 cd "$(dirname "$0")/.."
 
 if [ ! -d lab/fonts ]; then
-  ln -fs ../../build/unhinted lab/fonts
+  ln -fs ../../build/fonts lab/fonts
 fi
 
 # jekyll is a little dumb and resolves the lab/fonts symlink and copies
@@ -11,15 +11,15 @@ fi
 # Let's work around that.
 #
 # Step 1/2: remove any previous symlink, or jekyll crashes
-rm -rf _site/lab/fonts
+rm -f _site/lab/fonts
 #
 # Step 2/2: create symlink again after some delay. Ugh.
 sh <<_EOF_ &
 N=3
 while [ \$N -gt 0 ]; do
   sleep 1
-  rm -rf _site/lab/fonts
-  ln -fs ../../../build/unhinted _site/lab/fonts
+  rm -f _site/lab/fonts
+  ln -fs ../../../build/fonts _site/lab/fonts
   let N=N-1
 done
 _EOF_
diff --git a/docs/inter-ui.css b/docs/inter-ui.css
index ccd5a0aff..542b6fd5d 100644
--- a/docs/inter-ui.css
+++ b/docs/inter-ui.css
@@ -2,14 +2,16 @@
   font-family: 'Inter UI';
   font-style:  normal;
   font-weight: 400;
-  src: url("font-files/Inter-UI-Regular.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-Regular.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-Regular.woff?v=2.5") format("woff");
 }
 @font-face {
   font-family: 'Inter UI';
   font-style:  italic;
   font-weight: 400;
-  src: url("font-files/Inter-UI-Italic.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-Italic.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-Italic.woff?v=2.5") format("woff");
 }
 
@@ -17,14 +19,16 @@
   font-family: 'Inter UI';
   font-style:  normal;
   font-weight: 500;
-  src: url("font-files/Inter-UI-Medium.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-Medium.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-Medium.woff?v=2.5") format("woff");
 }
 @font-face {
   font-family: 'Inter UI';
   font-style:  italic;
   font-weight: 500;
-  src: url("font-files/Inter-UI-MediumItalic.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-MediumItalic.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-MediumItalic.woff?v=2.5") format("woff");
 }
 
@@ -32,14 +36,16 @@
   font-family: 'Inter UI';
   font-style:  normal;
   font-weight: 700;
-  src: url("font-files/Inter-UI-Bold.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-Bold.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-Bold.woff?v=2.5") format("woff");
 }
 @font-face {
   font-family: 'Inter UI';
   font-style:  italic;
   font-weight: 700;
-  src: url("font-files/Inter-UI-BoldItalic.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-BoldItalic.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-BoldItalic.woff?v=2.5") format("woff");
 }
 
@@ -47,13 +53,37 @@
   font-family: 'Inter UI';
   font-style:  normal;
   font-weight: 900;
-  src: url("font-files/Inter-UI-Black.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-Black.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-Black.woff?v=2.5") format("woff");
 }
 @font-face {
   font-family: 'Inter UI';
   font-style:  italic;
   font-weight: 900;
-  src: url("font-files/Inter-UI-BlackItalic.woff2?v=2.5") format("woff2"),
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url("font-files/Inter-UI-BlackItalic.woff2?v=2.5") format("woff2"),
        url("font-files/Inter-UI-BlackItalic.woff?v=2.5") format("woff");
 }
+
+/*
+Single variable font.
+Note that you may want to do something like this to make sure you're serving
+constant fonts to older browsers:
+
+html {
+  font-family: 'Inter UI', sans-serif;
+}
+@supports (font-variation-settings: normal) {
+  html {
+    font-family: 'Inter UI var', sans-serif;
+  }
+}
+
+*/
+@font-face {
+  font-family: 'Inter UI var';
+  font-weight: 400 900; /* safe weight range */
+  src: url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2-variations"),
+       url('font-files/Inter-UI.var.woff2?v=2.6') format("woff2");
+}
diff --git a/docs/lab/index.html b/docs/lab/index.html
index 8c1295516..9deb630d3 100644
--- a/docs/lab/index.html
+++ b/docs/lab/index.html
@@ -753,78 +753,95 @@ for (const ch of uniqueChars) {
   font-family: 'Inter-UI-VERSION';
   font-style:  normal;
   font-weight: 400;
-  src: url("fonts/Inter-UI-Regular.woff2") format("woff2"),
-       url("fonts/Inter-UI-Regular.woff") format("woff");
+  src: url("fonts/const/Inter-UI-Regular.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-Regular.woff") format("woff");
 }
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  italic;
   font-weight: 400;
-  src: url("fonts/Inter-UI-Italic.woff2") format("woff2"),
-       url("fonts/Inter-UI-Italic.woff") format("woff");
+  src: url("fonts/const/Inter-UI-Italic.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-Italic.woff") format("woff");
 }
 
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  normal;
   font-weight: 500;
-  src: url("fonts/Inter-UI-Medium.woff2") format("woff2"),
-       url("fonts/Inter-UI-Medium.woff") format("woff");
+  src: url("fonts/const/Inter-UI-Medium.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-Medium.woff") format("woff");
 }
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  italic;
   font-weight: 500;
-  src: url("fonts/Inter-UI-MediumItalic.woff2") format("woff2"),
-       url("fonts/Inter-UI-MediumItalic.woff") format("woff");
+  src: url("fonts/const/Inter-UI-MediumItalic.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-MediumItalic.woff") format("woff");
 }
 
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  normal;
   font-weight: 700;
-  src: url("fonts/Inter-UI-Bold.woff2") format("woff2"),
-       url("fonts/Inter-UI-Bold.woff") format("woff");
+  src: url("fonts/const/Inter-UI-Bold.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-Bold.woff") format("woff");
 }
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  italic;
   font-weight: 700;
-  src: url("fonts/Inter-UI-BoldItalic.woff2") format("woff2"),
-       url("fonts/Inter-UI-BoldItalic.woff") format("woff");
+  src: url("fonts/const/Inter-UI-BoldItalic.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-BoldItalic.woff") format("woff");
 }
 
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  normal;
   font-weight: 900;
-  src: url("fonts/Inter-UI-Black.woff2") format("woff2"),
-       url("fonts/Inter-UI-Black.woff") format("woff");
+  src: url("fonts/const/Inter-UI-Black.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-Black.woff") format("woff");
 }
 @font-face {
   font-family: 'Inter-UI-VERSION';
   font-style:  italic;
   font-weight: 900;
-  src: url("fonts/Inter-UI-BlackItalic.woff2") format("woff2"),
-       url("fonts/Inter-UI-BlackItalic.woff") format("woff");
+  src: url("fonts/const/Inter-UI-BlackItalic.woff2") format("woff2"),
+       url("fonts/const/Inter-UI-BlackItalic.woff") format("woff");
 }
 
-.inter-ui, .inter-ui input, .inter-ui select {
+.inter-ui,
+.inter-ui input,
+.inter-ui select {
   font-family: 'Inter-UI-VERSION', 'Inter UI', serif !important;
 }
 
+@font-face {
+  font-family: 'Inter-UI-var-VERSION';
+  font-weight: 400 900;
+  src: url('fonts/var/Inter-UI.var.woff2') format("woff2-variations");
+}
+
+body.varfont .inter-ui,
+body.varfont .inter-ui input,
+body.varfont .inter-ui select {
+  font-family: 'Inter-UI-var-VERSION', 'Inter UI var', serif !important;
+}
+
     </style>
     <link href="lab.css" rel="stylesheet">
     <script type="text/javascript">
 
 const fontVersion = Math.round(Date.now()).toString(36)
 let fontFamilyName = 'Inter-UI-v' + fontVersion
+let fontFamilyNameVar = 'Inter-UI-var-v' + fontVersion
 const fontCSSTemplate = document.querySelector('#font-css')
 const fontCSS = fontCSSTemplate.cloneNode(true)
 fontCSS.innerHTML = fontCSS.innerHTML
+  .replace(/Inter-UI-var-VERSION/g, fontFamilyNameVar)
   .replace(/Inter-UI-VERSION/g, fontFamilyName)
   .replace(/(\.woff2?)/g, '$1?r='+fontVersion)
 fontFamilyName += ", 'Inter UI'"
+fontFamilyNameVar += ", 'Inter UI var'"
 fontCSS.setAttribute('id', '')
 fontCSS.setAttribute('type', 'text/css')
 document.head.appendChild(fontCSS)
@@ -833,19 +850,47 @@ document.head.appendChild(fontCSS)
   </head>
   <body>
     <div class="options inter-ui">
-      <select name="sample"></select>
 
-      <label>
-        <input type="number" value="13" step="1" min="4" max="1024" name="size">
-        <select name="weight" style="max-width:120px">
+      <label class="style">
+        <select name="weight" style="max-width:100px">
           <!--option value="200">Thin (200)</option>
           <option value="300">Light (300)</option-->
           <option value="400" selected>Regular (400)</option>
           <option value="500">Medium (500)</option>
           <option value="700">Bold (700)</option>
+          <option value="800">Extra Bold (800)</option>
           <option value="900">Black (900)</option>
         </select>
         <label style="display:inline-block; margin-left:4px"><input type="checkbox" name="italic"> <em>Italic</em></label>
+        <label>
+          <input type="checkbox" class="featopt" name="varfont"
+          title="Enable variable font (experimental!)">
+          <span>Variable</span>
+        </label>
+      </label>
+
+      <div class="checkbox-group varfontControl">
+        <span>Variable axes:</span>
+        <label class="label-and-value">
+          <span>Weight:</span>
+          <input type="range" value="400" min="400" max="900" name="varWeight">
+          <input type="number" value="400" step="1" min="400" max="900" name="varWeightNum">
+        </label>
+        <label class="label-and-value">
+          <span>Italic:</span>
+          <input type="range" value="0" min="0" max="100" name="varItalic">
+          <input type="number" value="0" step="1" min="0" max="100" name="varItalicNum">
+        </label>
+      </div>
+
+      <label class="label-and-value">
+        <span>Size:</span>
+        <input type="number" value="13" step="1" min="4" max="1024" name="size">
+      </label>
+
+      <label class="label-and-value">
+        <span>Sample text:</span>
+        <select name="sample"></select>
       </label>
 
       <div class="checkbox-group repertoireControl">
@@ -1336,6 +1381,11 @@ function main() {
     // setCSSProp('line-height', Math.ceil(v * 1.5) + 'px')
   })
 
+  let usingVarFont = false
+  var varWeightRange, varItalicRange
+  var varWeightSettingValueImpl = false
+  var varItalicSettingValueImpl = false
+
   let currentBodyWeightClass = null
   vars.bind('weight', (e, v) => {
     setCSSProp('font-weight', v)
@@ -1345,8 +1395,87 @@ function main() {
     document.body.classList.add(currentBodyWeightClass = 'font-weight-'+v)
   })
 
-  vars.bind('italic', (e, on) => {
+  var italicVar = vars.bind('italic', (e, on) => {
     document.body.classList[on ? 'add' : 'remove']('italic')
+    if (usingVarFont && !varItalicSettingValueImpl) {
+      if (varItalicRange) {
+        varItalicRange.setValue(on ? 100 : 0)
+      }
+      updateVarFont()
+    }
+  })
+
+  let varState = {
+    weight: 400,
+    italic: 0,
+  }
+
+  function updateVarFont() {
+    if (usingVarFont) {
+      varItalicSettingValueImpl = true
+      if (varState.italic <= 0.1) {
+        varState.italic = 0
+        italicVar.setValue(false)
+      } else {
+        italicVar.setValue(true)
+      }
+      varItalicSettingValueImpl = false
+      setCSSProp(
+        "font-variation-settings",
+        `"wght" ${varState.weight}, "ital" ${varState.italic}`
+      )
+    } else {
+      setCSSProp("font-variation-settings", null)
+    }
+  }
+
+  vars.bind('varfont', (e, on) => {
+    usingVarFont = on
+    document.body.classList[on ? 'add' : 'remove']('varfont')
+    document.body.style.fontFamily = on ? fontFamilyNameVar : fontFamilyName;
+    updateVarFont()
+  })
+
+  let varWeightNum = vars.bind('varWeightNum', (e, v) => {
+    if (varWeightRange && !varWeightSettingValueImpl) {
+      varWeightRange.setValue(v)
+    }
+  })
+
+  let varItalicNum = vars.bind('varItalicNum', (e, v) => {
+    if (varItalicRange && !varItalicSettingValueImpl) {
+      varItalicRange.setValue(v)
+    }
+  })
+
+  varWeightRange = vars.bind('varWeight', (e, v) => {
+    varState.weight = v
+    varWeightSettingValueImpl = true
+    varWeightNum.setValue(v)
+    varWeightSettingValueImpl = false
+    updateVarFont()
+  }, (e, prevValue, ev) => {
+    if (prevValue === undefined) {
+      return 400
+    }
+    return e.valueAsNumber !== undefined ? e.valueAsNumber : e.value
+  })
+
+  varItalicRange = vars.bind('varItalic', (e, v) => {
+    varState.italic = v
+    varItalicSettingValueImpl = true
+    varItalicNum.setValue(v)
+    varItalicSettingValueImpl = false
+    updateVarFont()
+  }, (e, prevValue, ev) => {
+    if (prevValue === undefined) {
+      return 0
+    }
+    return e.valueAsNumber !== undefined ? e.valueAsNumber : e.value
+  })
+
+  vars.bind('varItalic', (e, v) => {
+    console.log('varItalic', v)
   })
 
 
diff --git a/docs/lab/lab.css b/docs/lab/lab.css
index a439ee415..b744490c7 100644
--- a/docs/lab/lab.css
+++ b/docs/lab/lab.css
@@ -12,9 +12,6 @@ body {
 .systemFont {
   font-family: system-ui,-apple-system,"SF Pro Text","SF UI Text",BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif;, serif;
 }
-.italic {
-  font-style: italic;
-}
 .de-emphasize {
   color:#555;
 }
@@ -44,7 +41,7 @@ h2 {
   top:0; right:0; bottom:0;
   background:#f4f4f4;
   padding: 24px;
-  user-select:none;
+  user-select:none; -moz-user-select: none;
   font-family: sans-serif !important;
   overflow: auto;
   letter-spacing:0.01em;
@@ -73,7 +70,7 @@ h2 {
     width:90px;
   }
   .options .label-and-value input {
-    width:50px;
+    width: 50px;
   }
   .options .label-and-value select {
     min-width:50px;
@@ -89,9 +86,49 @@ h2 {
   .options label.rasterizePhrase input {
     width:100%;
   }
+  .options label.style {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+  }
+  .options input[type="checkbox"] + * {
+    user-select: none; -moz-user-select: none;
+  }
+  .options .varfontControl {
+    display: none;
+  }
+  body.varfont .options .varfontControl {
+    display: block;
+  }
+  .options .varfontControl .label-and-value {
+    display: flex;
+  }
+  .options .varfontControl .label-and-value > span {
+    padding-left: 10px;
+    width: 80px;
+    flex: 0 0 auto;
+  }
+  .options .varfontControl input[type="range"] {
+    flex: 1 1 auto;
+  }
+  .options .varfontControl input[type="number"] {
+    flex: 0 1 auto;
+    width: 35px;
+    border: none;
+    padding: 0;
+    margin-left: 4px;
+  }
+  body.varfont .options select[name="weight"] {
+    pointer-events: none;
+    opacity: 0.4;
+  }
 
 input[type="number"] {
   width:50px;
+  background: none;
+  border: 1px solid rgba(0,0,0,0.2);
+  padding: 4px;
+  border-radius: 2px;
 }
 
 label {
@@ -119,6 +156,15 @@ samples {
   padding: 24px 0;
   width:100%;
 }
+body.italic samples {
+  font-style: italic;
+}
+body.varfont.italic samples {
+  /* [BUG] (Safari 11.1) font-style:italic and ital axis is not
+     mutually exclusive, meaning we have to set either or. */
+  font-style: normal;
+  font-variation-settings: 'ital' 100;
+}
   sample {
     margin: 0;
     /*white-space: pre;*/
diff --git a/docs/lab/var.html b/docs/lab/var.html
new file mode 100644
index 000000000..947b8d6c5
--- /dev/null
+++ b/docs/lab/var.html
@@ -0,0 +1,208 @@
+<!DOCTYPE HTML>
+<html lang="en">
+<head>
+<meta charset="utf-8">
+<link href="../inter-ui.css" rel="stylesheet">
+<style type="text/css">
+
+@font-face {
+  font-family: 'Inter UI var';
+  font-weight: 400 900;
+  src: url('fonts/var/Inter-UI.var.woff2') format("woff2-variations"),
+       url('../font-files/Inter-UI.var.woff2') format("woff2-variations");
+}
+
+html {
+  font-family: 'Inter UI', sans-serif;
+  font-size: 14px;
+  letter-spacing: 0.001em;
+}
+body {
+  margin: 0;
+  padding: 0;
+}
+
+.sample {
+  padding: 40px 40px 40px 35px;
+  font-size: 96px;
+  letter-spacing: -0.03em;
+  /*font-variation-settings: 'wght' 400, 'ital' 0;*/
+}
+
+@supports (font-variation-settings: normal) {
+  html {
+    font-family: 'Inter UI var', sans-serif;
+  }
+}
+
+label {
+  user-select: none;
+}
+
+.ctrl {
+  display: flex;
+  /*justify-content:center;*/
+  align-items:center;
+  background: #e5e5e5;
+  color: #333;
+  padding:20px 20px 20px 40px;
+}
+  .ctrl input {
+    margin:0 8px;
+  }
+  .ctrl label {
+    display: flex;
+    /*justify-content:center;*/
+    align-items:center;
+    margin-right:20px;
+  }
+
+</style>
+</head>
+<body>
+<div class="ctrl">
+  <label>
+    Weight:
+    <input type="range" value="400" min="400" max="900" name="weight">
+  </label>
+  <label>
+    Italic:
+    <input type="range" value="0" min="0" max="100" name="italic">
+  </label>
+  <label>
+    <input type="checkbox" name="animate">
+    Animate
+  </label>
+</div>
+<div class="sample" contenteditable>
+Inter UI 2.6 coming soon <br>
+Refined glyphs & kerning <br>
+Variable weight axis <br>
+Major overhaul 123ABC! <br>
+</div>
+<script type="text/javascript">
+
+var state = {
+  weight: 400,
+  italic: 0,
+}
+
+var samples = document.querySelectorAll('div.sample')
+var weightInput = document.querySelector('[name="weight"]')
+var italicInput = document.querySelector('[name="italic"]')
+
+weightInput.value = String(state.weight)
+italicInput.value = String(state.italic)
+
+function updateFontVariationSettings() {
+  for (let i = 0; i < samples.length; i++) {
+    let sample = samples[i]
+    // sample.style.fontVariationSettings =
+    //   `'wght' ${state.weight}, 'ital' ${state.italic}`
+    sample.style.fontVariationSettings =
+      `'wght' ${state.weight}, 'ital' ${state.italic}`
+  }
+}
+
+function setWeight(weight) {
+  state.weight = weight
+  updateFontVariationSettings()
+}
+
+function setItalic(italic) {
+  state.italic = italic
+  updateFontVariationSettings()
+}
+
+// monotime() :float  milliseconds
+//
+var monotime = (
+  window.performance !== undefined && window.performance.now ? function() {
+    return window.performance.now()
+  } : Date.now ? function() {
+    return Date.now()
+  } : function() {
+    return (new Date()).getTime()
+  }
+)
+
+
+var isAnimating = false
+function startAnimation() {
+  if (isAnimating) {
+    return
+  }
+  weightInput.disabled = true
+  isAnimating = true
+  let v = 0
+  let wmin = parseFloat(weightInput.min)
+    , wmax = parseFloat(weightInput.max)
+    , imin = parseFloat(italicInput.min)
+    , imax = parseFloat(italicInput.max)
+    , wspeed = 200    // lower is faster; time divisor
+    , ispeed = 800
+    , clamp = 0.001
+    , startTime = monotime()
+  function update() {
+    let r = 0, v = 0
+
+    r = (1 + Math.sin((monotime() - startTime) / wspeed)) * 0.5
+    v = (wmin * (1 - clamp)) + (((wmax * (1 + clamp)) - (wmin * (1 - clamp))) * r)
+    v = Math.max(wmin, Math.min(wmax, v))
+    setWeight(v)
+    weightInput.value = v
+
+    r = (1 + Math.sin((monotime() - startTime) / ispeed)) * 0.5
+    v = (imin * (1 - clamp)) + (((imax * (1 + clamp)) - (imin * (1 - clamp))) * r)
+    v = Math.max(imin, Math.min(imax, v))
+    setItalic(v)
+    italicInput.value = v
+    
+    if (isAnimating) {
+      requestAnimationFrame(update)
+    }
+  }
+  update()
+}
+
+function stopAnimation() {
+  isAnimating = false
+  weightInput.disabled = false
+  weightInput.value = String(state.weight)
+}
+
+// UI control: weight slider
+weightInput.addEventListener('input',
+  weightInput.valueAsNumber !== undefined ? ev => {
+    setWeight(weightInput.valueAsNumber)
+  } : ev => {
+    setWeight(parseFloat(weightInput.value))
+  }
+)
+
+// UI control: italic slider
+italicInput.addEventListener('input',
+  italicInput.valueAsNumber !== undefined ? ev => {
+    setItalic(italicInput.valueAsNumber)
+  } : ev => {
+    setItalic(parseFloat(italicInput.value))
+  }
+)
+
+// UI control: animate
+var animateInput = document.querySelector('[name="animate"]')
+if (!window.requestAnimationFrame) {
+  animateInput.disabled = true
+} else {
+  animateInput.addEventListener('change', ev => {
+    if (animateInput.checked) {
+      startAnimation()
+    } else {
+      stopAnimation()
+    }
+  })
+}
+
+</script>
+  </body>
+</html>
\ No newline at end of file