Test 1

Test 1

 発売日: 2025/8/20 更新日: 2025/8/20

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HTML (HyperText Markup Language) is the most basic building block of the Web. It defines the meaning and structure of web content. Other technologies besides HTML are generally used to describe a web page's appearance/presentation (CSS) or functionality/behavior (JavaScript).

"Hypertext" refers to links that connect web pages to one another, either within a single website or between websites. Links are a fundamental aspect of the Web. By uploading content to the Internet and linking it to pages created by other people, you become an active participant in the World Wide Web.

HTML uses "markup" to annotate text, images, and other content for display in a Web browser. HTML markup includes special "elements" such as , 

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HTML provides several ways to convey description semantics, whether inline or as structured glossaries. In this article, we'll cover how to properly mark up keywords when you're defining them.

Prerequisites:You need to be familiar with how to create a basic HTML document.
Objective:Learn how to introduce new keywords and how to build description lists.

When you need a term defined, you probably go straight to a dictionary or glossary. Dictionaries and glossaries formally associate keywords with one or more descriptions, as in this case:

Blue (Adjective)

Of a color like the sky in a sunny day. "The clear blue sky"

But we're constantly defining keywords informally, as here:

Firefox is the web browser created by the Mozilla Foundation.

To deal with these use cases, HTML provides tags to mark descriptions and words described, so that your meaning gets across properly to your readers.

How to mark informal description

In textbooks, the first time a keyword occurs, it's common to put the keyword in bold and define it right away.

We do that in HTML too, except HTML is not a visual medium and so we don't use bold. We use , which is a special element just for marking the first occurrence of keywords. Note that  tags go around the word to be defined, not the definition (the definition consists of the entire paragraph):

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