21. What is the `<details>` tag in HTML and how is it used?

What is the <details> Tag and How is it Used?

The <details> tag in HTML is an interactive element that allows users to disclose additional information on demand. It is commonly used to create expandable content sections, such as FAQs or additional reading content.

Basic Usage

Here is a simple example of how to use the <details> tag:

<details>
  <summary>Click to see more details</summary>
  <p>This is the additional content that was hidden before.</p>
</details>

In this example:

• The <summary> tag provides a summary or heading for the content that can be expanded. It acts as the clickable area to toggle the visibility of the content inside <details>.
• The <p> inside <details> holds the content that is initially hidden and becomes visible when the user clicks on the <summary>.

Accessibility

The <details> and <summary> elements are designed to be accessible by default, supporting keyboard navigation and screen readers. This makes them a great choice for enhancing user experience without requiring additional JavaScript or CSS for basic functionality.

Use Cases

• FAQs: You can use <details> to create expandable sections for frequently asked questions.
• Content Expansion: Providing more detailed information that users can choose to view.
• Progressive Disclosure: Offering additional content without overwhelming the user with information upfront.

Overall, the <details> tag is a powerful tool for managing content visibility in a user-friendly and accessible manner.