JavaScript フレームワークやライブラリへの依存度が高まるにつれて、多くの人は HTML にあまり注意を払わなくなりました。その結果、Web サイトの機能を大幅に強化できる HTML の多くの機能を最大限に活用できなくなります。また、セマンティック HTML を記述することで、Web サイトのコンテンツに正しいコンテキストを追加でき、ユーザー エクスペリエンスが大幅に向上します。
<!DOCTYPE html>
<html>
<head>
<base href="https://www.google.com/" target="_blank">
</head>
<body>
<h1>The base element(Google As a case study)</h1>
<p> <a href="gmail">Gmail</a> - Used to send emails; which are messages distributed by electronic means from one computer user to one or more recipients via a network.</p>
<p><a href="hangouts">Hangouts</a> - It's used for Messaging, Voice and Video Calls</p>
</body>
</html>
こうすることで、リクエストごとに URL プレフィックスを繰り返す必要がなくなります。
HTML ドキュメント内に <code><base> 要素は 1 つだけ存在でき、<code> 要素内に配置する必要があります。
<p><dfn title="HyperText Markup Language">HTML</dfn>
Is the standard markup language for creating web pages.
</p>
也可以与 <code><abbr></abbr> 结合使用：
<!DOCTYPE html>
<html>
<body>
<p><dfn><abbr title="HyperText Markup Language">HTML</abbr></dfn>
It's the standard markup language for creating web pages.</p>
</body>
</html>
这可以增强可访问性，因为这样编写语义 HTML 可以使阅读器和浏览器在适合用户的上下文中解释页面上的内容。
<details>
<summary>
<span>I am an introvert</span>
</summary>
<div>An introvert is a person with qualities of a personality type known as introversion, which means that they feel more comfortable focusing on their inner thoughts and ideas, rather than what's happening externally. They enjoy spending time with just one or two people, rather than large groups or crowds</div>
<div>
</details>
<blockquote cite="https://en.wikipedia.org/wiki/History_of_Nigeria">
The history of Nigeria can be traced to settlers trading across the middle East and Africa as early as 1100 BC. Numerous ancient African civilizations settled in the region that is known today as Nigeria, such as the Kingdom of Nri, the Benin Empire, and the Oyo Empire. Islam reached Nigeria through the Borno Empire between (1068 AD) and Hausa States around (1385 AD) during the 11th century,[1][2][3][4] while Christianity came to Nigeria in the 15th century through Augustinian and Capuchin monks from Portugal. The Songhai Empire also occupied part of the region.[5]
</blockquote>
<p>The best movie ever made is <cite>The Godfather</cite> by
Francis Ford Coppola . My favorite song is <cite>Monsters You Made</cite> by the Burna boy.</p>
下部の左隅で画像上のカーソルの座標を読み取ることも、水平面と垂直面でルーラーを使用することもできます。 
