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  <!-- CDNからのVueライブラリの読み込み -->
  <script src=""></script>
  <!-- idでもclassでもnameでも好きなセレクタでいいけど、通常はid=app -->
  <div id="app_test">
    <!-- {{変数名}} で値を表示 -->
    <p>文字数: {{tweet.length}}/10</p>
    <!-- v-modelディレクティブ -->
    <textarea v-model="tweet"></textarea>
    <!-- v-ifディレクティブ -->
    <p v-if="tweet.length > 10">
    // Vueインスタンスの作成
    new Vue({
      el: "#app_test",  // この要素に出力
      data() {     // 変数を定義&初期化
        return {
          // 変数名: 値
          tweet: "さえずるな!",


                body {
  font-family: system-ui;
  background: #f06d06;
  color: white;
  text-align: center;