What is the use of open Attribute in <details> Tag ?

The “open” attribute in <details> Tags are used to specify whether the additional details within the details element should be initially visible or hidden when the page loads.

This attribute is particularly useful for providing users with collapsible sections of content that can be expanded or collapsed as needed, improving the organization and readability of web pages.

Syntax

<details open>
  <summary>Click to Expand</summary>
  <!-- Additional details content here -->
</details>

Key Point	Description
Initial Visibility	The “open” attribute determines whether the additional details within the <details> element is initially visible (open) or hidden (closed).
User Interaction	Users can interact with the details element by clicking on the summary element, and toggling the visibility of the additional content.
Accessibility	Providing collapsible sections of content with the “open” attribute improves accessibility by allowing users to easily navigate and focus on relevant information.
Browser Compatibility	The “open” attribute is supported in most modern browsers, but older browsers may not support this attribute, so fallback mechanisms may be necessary.

Features

• Initial Visibility: Use the “open” attribute to specify that the additional details within the <details> element should be initially visible.
• Collapsed by Default: If the “open” attribute is omitted or set to open, the additional details will be collapsed by default, and users can click the summary element to expand them.
• User Interaction: Users can interact with the details element by clicking on the summary element, toggling the visibility of the additional content as needed.