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Babel includes JSX processing.

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                <!-- href属性には、ブックマークレットに登録したいコードを記述しておく -->
<!-- つまり外部のJavaScriptファイルを読み込む処理だけを記述 -->

<svg width="180px" height="169px" viewBox="0 0 180 169" xmlns:xlink="">
  <path d="M78.6526731,78.8139678 L39.648926,0 L0,78.4913784 L24.6122528,72.2360609 C33.19463,158.594939 180,168.463287 180,168.463287 C180,168.463287 45.5977982,146.323177 50.8010359,72.3597413 L78.6526731,78.8139678 Z"></path>

<a href="javascript:(function(){var s = document.createElement('script');s.src='';document.body.appendChild(s);})()">LIGブログを沈める</a>

  /* 配付用ページの CSS(ブックマークレットの動作には関係がない) */
  svg {
    width: 180px;
    fill: #3f42af;
  a {
    display: inline-block;
    padding: 15px 30px;
    color: white;
    background-color: #3f42af;
    border-radius: 5px;
    box-shadow: 0px 3px 16px 1px #3f42af;
    letter-spacing: .1em;
    text-decoration: none;



                // CSSが必要な場合は、ここに書いてJSから読み込むこともできる
.underwater-container {
  width: 100vw;
  height: 100vh;
  background-image: url('');
  background-size: cover;
  background-position: center center;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9999;
  opacity: .2;
  pointer-events: none;


                // ここは後から呼び出す外部ファイルの処理を書く。つまり外部ファイルそのもの。
let underwater = document.createElement('div');
underwater.innerHTML = `
  <link rel="stylesheet" href="">
  <div class="underwater-container"></div>