HTML Demo: <dl>

<p>Web developers use these languages when they create a site:</p>

<dl>
    <dt>HTML</dt>
    <dd><em>HyperText Markup Language</em> describes the structure of the page and its contents.</dd>
    <dt>CSS</dt>
    <dd><em>Cascading Style Sheets</em> describes how a site looks and even to some extent how it responds to certain events.</dd>
    <dt>JavaScript</dt>
    <dd>JavaScript is the programming language used to define the logic and function of a site beyond simple look and feel. Any computation or "thinking" is done using JavaScript.</dd>
</dl>

p,
dl {
    font: 1rem 'Fira Sans', sans-serif;
}

dl > dt {
    font-weight: bold;
    text-decoration: underline;
}

Output