ckeditor/ckeditor5-heading

<style>
    h2.fancy, .ck-heading_heading2_fancy {
        color: #ff0050;
        font-size: 17px;
    }
</style>

<div id="snippet-custom-heading-elements">
    <h1>Heading 1</h1>
    <h2>Heading 2</h2>
    <h2 class="fancy">Fancy Heading 2</h2>
    <p>This is <a href="https://ckeditor.com">CKEditor 5</a>.</p>
</div>