Concept

The <abbr> tag in HTML is used to define an abbreviation or an acronym.

When using the <abbr> tag, you can provide the reader with additional information about the abbreviation when they hover over the abbreviation.

Usage

<p>HTML là một ngôn ngữ đánh dấu để xây dựng các trang web.</p>
<p><abbr title="HyperText Markup Language">HTML</abbr> là một ngôn ngữ đánh dấu để xây dựng các trang web.</p>

Result

In the example above, we have two paragraphs. The first paragraph does not use the <abbr> tag, while the second paragraph uses the <abbr> tag to define the abbreviation "HTML" and provide additional information "HyperText Markup Language" when the reader hovers over the abbreviation.