HTML - Tags - <details>

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 <html>
 <body>
    <details>
        <summary>How fast does light travel?</summary>
        <p>The speed of light is 186,000 miles per second,
        or 300,000,000 meters per second.</p>
    </details>
 </body>
 </html>
 

The details element creates a control that can be expanded to reveal additional information.

A live example:


How fast does light travel?

The speed of light is 186,000 miles per second, or 300,000,000 meters per second.


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© Richard McGrath