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HTML

              
                <!-- 本来はheadタグ内、もしくはbodyタグ内の末尾に記述する -->
<script>
url = 'https://fonts.googleapis.com/css?family=Noto+Sans+JP'
xhr = new XMLHttpRequest()
xhr.open('GET', url)
xhr.onreadystatechange = function () {
  if (xhr.readyState !== 4 || xhr.status !== 200) return
  var style
  style = document.createElement('style')
  style.innerHTML = xhr.responseText.replace(/}/g, 'font-display: swap; }')
  document.head.appendChild(style)
}
xhr.send()
</script>

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CSS

              
                body {
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 30px;
}
              
            
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JS

              
                
              
            
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