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                <button id="js-paste">テキストをペースト</button>

<pre style="width: 300px;margin-top: 20px;border: 2px dashed;padding: 10px">このテキストをコピーしてみてください。</pre>

<textarea id="target" placeholder="ここにペーストされます。" style="width: 300px; height: 200px; margin-top: 20px"></textarea>




                // ペーストボタン
const btn_paste = document.querySelector('#js-paste');
// ペースト対象となるテキストエリア
const paste_target = document.querySelector('#target');

btn_paste.addEventListener('click', () => {
  const result = pasteText((text) => {
    paste_target.value = text;

const pasteText = (callback) => {
  // 閲覧しているブラウザが「navigator.clipboard」に
  // 対応しているか確認
    // クリップボードにあるテキストを読み込み
    navigator.clipboard.readText().then((text) => {
      // 読み込んだテキストを操作
    return true;
  } else {
    return false;