Example
An open/visible <details> element:
<details open>
<summary>Copyright 1999-2014.</summary>
<p> - by Refsnes Data. All Rights Reserved.</p>
<p>All content and graphics on this web site are the property of the company Refsnes Data.</p>
</details>
Try it Yourself »
Definition and Usage
The open attribute is a boolean attribute.
When present, it specifies that the details should be visible (open) to the user.
Browser Support
The numbers in the table specify the first browser version that fully supports the attribute.
| Attribute | |||||
|---|---|---|---|---|---|
| open | 12.0 | Not supported | Not supported | 6.0 | 15.0 |
Differences Between HTML 4.01 and HTML5
The <details> tag is new in HTML5.
Differences Between HTML and XHTML
In XHTML, attribute minimization is forbidden, and the open attribute must be defined as <details open="open">.
Syntax
<details open>