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CSS

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HTML 

              
                <!-- デモ用フォントの読み込み -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400;1,500;1,700&display=swap" rel="stylesheet">

<!-- ドロップダウンでフォントを選ぶ場合、スタイル切り替えの際にフォールバックフォントが一瞬表示されることがあるためプリロードしておく -->
<link rel="preload" href="path" as="font" type="font/woff2" crossorigin />

<!-- font-weight, font-style / ドロップダウンでスタイルを選択する場合 -->
<div class="typeface" id='dmsans'>
  <select name="weight" class="typeface__select">
    <!--   weight-styleをvalueに記述する -->
    <option value="400-normal" selected>Regular</option>
    <option value="400-italic">Regular Italic</option>
    <option value="500-normal">Medium</option>
    <option value="500-italic">Medium Italic</option>
    <option value="700-normal">Bold</option>
    <option value="700-italic">Bold Italic</option>
  </select>
  <div class="typeface__features">
    <!--   適用できるOpenType機能をvalueに入れたチェックボックスを作る -->
    <label><input value='kern' class="typeface__check" type="checkbox" checked>kern</label>
    <label><input value='liga' class="typeface__check" type="checkbox" checked>liga</label>
    <label><input value='ss01' class="typeface__check" type="checkbox">ss01</label>
    <label><input value='ss02' class="typeface__check" type="checkbox">ss02</label>
    <label><input value='ss03' class="typeface__check" type="checkbox">ss03</label>
    <label><input value='ss04' class="typeface__check" type="checkbox">ss04</label>
  </div>
  <!--     フォントサイズの調整スライダー -->
  <input class="typeface__fontsize" type="range" name="size" min="4" max="200" value="36">
  <textarea class="typeface__area">Test Typeface with font-weight and font-style</textarea>
</div>
<!-- font-familyをドロップダウンで選択する場合 -->
<div class="typeface" id='koga'>
  <select name="weight" class="typeface__select">
    <!-- font-familyをvalueに記述する -->
    <option value="koga-sans-book" selected>Book</option>
    <option value="koga-sans-medium">Medium</option>
    <option value="koga-sans-semibold">Semi Bold</option>
    <option value="koga-sans-bold">Bold</option>
  </select>
  <div class="typeface__features">
    <!--   適用できるOpenType機能をvalueに入れたチェックボックスを作る -->
    <label><input value='kern' class="typeface__check" type="checkbox" checked>kern</label>
    <label><input value='onum' class="typeface__check" type="checkbox">onum</label>
    <label><input value='smcp' class="typeface__check" type="checkbox">smcp</label>
    <label><input value='ss01' class="typeface__check" type="checkbox">ss01</label>
    <label><input value='ss02' class="typeface__check" type="checkbox">ss02</label>
    <label><input value='ss03' class="typeface__check" type="checkbox">ss03</label>
    <label><input value='ss04' class="typeface__check" type="checkbox">ss04</label>
  </div>
  <!--     フォントサイズの調整スライダー -->
  <input class="typeface__fontsize" type="range" name="size" min="4" max="200" value="36">
  <textarea class="typeface__area">Test Typeface with font-family</textarea>
</div>

<!-- バリアブルフォントをスライダーで調整する場合 -->
<div class="typeface" id='modern'>
  <input class="typeface__slider" type="range" name="weight" min="100" max="900" value="400">
  <div class="typeface__features">
    <!--   適用できるOpenType機能をvalueに入れたチェックボックスを作る -->
    <label><input value='kern' class="typeface__check" type="checkbox" checked>kern</label>
    <label><input value='onum' class="typeface__check" type="checkbox">onum</label>
    <label><input value='dlig' class="typeface__check" type="checkbox">dlig</label>
    <label><input value='ss01' class="typeface__check" type="checkbox">ss01</label>
    <label><input value='ss02' class="typeface__check" type="checkbox">ss02</label>
    <label><input value='ss03' class="typeface__check" type="checkbox">ss03</label>
    <label><input value='ss04' class="typeface__check" type="checkbox">ss04</label>
  </div>
  <!--     フォントサイズの調整スライダー -->
  <input class="typeface__fontsize" type="range" name="size" min="4" max="200" value="36">
  <textarea class="typeface__area">Test Typeface with font-variation-settings</textarea>
</div>
!

CSS 

              
                // デモ用書体の読み込み
@font-face {
  font-family: "koga-sans-book";
  src: url("https://wolphtype.com/font/KogaSansText-Book.woff2") format("woff2");
}
@font-face {
  font-family: "koga-sans-medium";
  src: url("https://wolphtype.com/font/KogaSansText-Medium.woff2") format("woff2");
}
@font-face {
  font-family: "koga-sans-semiBold";
  src: url("https://wolphtype.com/font/KogaSansText-SemiBold.woff2") format("woff2");
}
@font-face {
  font-family: "koga-sans-bold";
  src: url("https://wolphtype.com/font/KogaSansText-Bold.woff2") format("woff2");
}
@font-face {
  font-family: "Koga Sans Modern";
  src: url("https://wolphtype.com/font/KogaSansModernVF.woff2") format("woff2");
}

// スタイリング
.typeface {
  margin-top: 30px;
  margin-left: 30px;
  &__features{
    margin-top: 20px;
  }
  &__fontsize{
    display: block;
    margin-top: 20px;
  }
  &__area{
    appearance: none;
    border: none;
    background-color: #eee;
    margin-top: 20px;
    padding: 10px;
    width: 80%;
    height: 300px;
    font-size: 36px;
    &:focus {
      outline: none;
    }
  }
}
#dmsans{
  font-family: "DM Sans", sans-serif;
  textarea{
    font-family: "DM Sans", sans-serif;
  }
}
#koga{
  font-family: "koga-sans-book", sans-serif;
  textarea{
    font-family: 'koga-sans-book', sans-serif;
  }
}
#modern{
  font-family: "Koga Sans Modern", sans-serif;
  textarea{
    font-family: 'Koga Sans Modern', sans-serif;
  }
}
!

JS 

              
                // フォントサイズ変更
$('.typeface__fontsize').on('input', function() {
  const fontSize = $(this).val();
  console.log(fontSize);
  $(this).nextAll('textarea').css('font-size', fontSize + 'px') 
// ↑場所によってtextareaに当たるように変更する
});
// font-weightとfont-styleでスタイルを変更
$('#dmsans .typeface__select').change(function() {
  var property = $(this).find('option:selected').val();
  var weightStyle = property.split('-');
  $('#dmsans textarea').css({'font-weight':weightStyle[0], 'font-style':weightStyle[1]})
});
// --dmsansのOpenType機能を変更
$('#dmsans .typeface__check').click(function() {
  var checked = $('#dmsans .typeface__check:checked').map(function() {
    return $(this).val();
  }).get();
  features = checked.join('\', \'');
  features = '\'' + features + '\'';
  $('#dmsans textarea').css('font-feature-settings', features)
});

// font-familyでスタイルを変更
$('#koga .typeface__select').change(function() {
  var style = $(this).find('option:selected').val();
  $('#koga textarea').css('font-family', style)
});
// #kogaのOpenType機能を変更
$('#koga .typeface__check').click(function() {
  var checked = $('#koga .typeface__check:checked').map(function() {
    return $(this).val();
  }).get();
  features = checked.join('\', \'');
  features = '\'' + features + '\'';
  $('#koga textarea').css('font-feature-settings', features)
});

// スライダーでバリアブルフォントを調整
$('#modern .typeface__slider').on('input', function() {
  const weight = $(this).val();
// 複数軸の場合, const italic = $(#italic).val();のようにそれぞれ定義する
  $('#modern textarea').css('font-variation-settings', `'wght' ${weight}`)
// 複数軸の場合、$('#modern textarea').css('font-variation-settings', `'wght' ${weight}, 'ital' ${italic}`) のように書く
});
!
999px

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