JSFiddle - React, Tailwind, and code Playground

HTML

<ol>
    <li class="done">Hello <span>World</span></li>
    <li>World</li>
</ol>

CSS

ol {
    margin: 0 30px;
}
    li {
        margin: 15px 0;
    }
    li.done {
        text-decoration: line-through;
    }
    li.done span {
        text-decoration: none;
        background: #ff0;
    }