list.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>见字-list</title>
    <style>
        .container {
            display: grid;
            place-items: center;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>见字</h1>
        <article-list></article-list>
        <template id="articleListTemplate">
            <ul>
                <li>
                    <a href="detail.html">
                        <span>历史：</span>
                        1906年-夏目漱石-《草枕》
                    </a>
                </li>
                <li>
                    <a href="detail.html">
                        <span>理想：</span>
                        日语平假名
                    </a>
                </li>
            </ul>
        </template>
    </div>

    <script>
        class ArticleList extends HTMLElement {
            constructor() {
                super();
                var shadow = this.attachShadow({ mode: 'closed' });

                var templateElem = document.getElementById('articleListTemplate');
                var content = templateElem.content.cloneNode(true);
                shadow.appendChild(content);
            }
        }
        window.customElements.define('article-list', ArticleList);
    </script>
</body>

</html>