<details>: The Details disclosure element
The <details>
HTML element creates a disclosure widget in which information is visible only when the widget is toggled into an "open" state. A summary or label must be provided using the <summary>
element.
A disclosure widget is typically presented onscreen using a small triangle which rotates (or twists) to indicate open/closed status, with a label next to the triangle. The contents of the <summary>
element are used as the label for the disclosure widget.
Try it
A <details>
widget can be in one of two states. The default closed state displays only the triangle and the label inside <summary>
(or a user agent-defined default string if no <summary>
).
When the user clicks on the widget or focuses it then presses the space bar, it "twists" open, revealing its contents. The common use of a triangle which rotates or twists around to represent opening or closing the widget is why these are sometimes called "twisty".
You can use CSS to style the disclosure widget, and you can programmatically open and close the widget by setting/removing its open
attribute. Unfortunately, at this time, there's no built-in way to animate the transition between open and closed.
By default when closed, the widget is only tall enough to display the disclosure triangle and summary. When open, it expands to display the details contained within.
Fully standards-compliant implementations automatically apply the CSS
to the display
: list-item<summary>
element. You can use this to customize its appearance further. See Customizing the disclosure widget for further details.
Attributes
This element includes the global attributes.
open
-
This Boolean attribute indicates whether the details — that is, the contents of the
<details>
element — are currently visible. The details are shown when this attribute exists, or hidden when this attribute is absent. By default this attribute is absent which means the details are not visible.Note: You have to remove this attribute entirely to make the details hidden.
open="false"
makes the details visible because this attribute is Boolean.
Events
In addition to the usual events supported by HTML elements, the <details>
element supports the toggle
event, which is dispatched to the <details>
element whenever its state changes between open and closed. It is sent after the state is changed, although if the state changes multiple times before the browser can dispatch the event, the events are coalesced so that only one is sent.
You can use an event listener for the toggle
event to detect when the widget changes state:
js
details.addEventListener("toggle", (event) => {
if (details.open) {
/* the element was toggled open */
} else {
/* the element was toggled closed */
}
});
Examples
A simple disclosure example
This example shows a simple <details>
element with a <summary>
.
html
<details>
<summary>System Requirements</summary>
<p>
Requires a computer running an operating system. The computer must have some
memory and ideally some kind of long-term storage. An input device as well
as some form of output device is recommended.
</p>
</details>
Result
Creating an open disclosure box
To start the <details>
box in its open state, add the Boolean open
attribute:
html
<details open>
<summary>System Requirements</summary>
<p>
Requires a computer running an operating system. The computer must have some
memory and ideally some kind of long-term storage. An input device as well
as some form of output device is recommended.
</p>
</details>
Result
Customizing the appearance
Now let's apply some CSS to customize the appearance of the disclosure box.
CSS
css
details {
font: 16px "Open Sans", Calibri, sans-serif;
width: 620px;
}
details > summary {
padding: 2px 6px;
width: 15em;
background-color: #ddd;
border: none;
box-shadow: 3px 3px 4px black;
cursor: pointer;
}
details > p {
border-radius: 0 0 10px 10px;
background-color: #ddd;
padding: 2px 6px;
margin: 0;
box-shadow: 3px 3px 4px black;
}
details[open] > summary {
background-color: #ccf;
}
This CSS creates a look similar to a tabbed interface, where clicking the tab opens it to reveal its contents.
The selector details[open]
can be used to style the element which is open.
HTML
html
<details>
<summary>System Requirements</summary>
<p>
Requires a computer running an operating system. The computer must have some
memory and ideally some kind of long-term storage. An input device as well
as some form of output device is recommended.
</p>
</details>
Result
Customizing the disclosure widget
The disclosure triangle itself can be customized, although this is not as broadly supported. There are variations in how browsers support this customization due to experimental implementations as the element was standardized, so we'll have to use multiple approaches for a while.
The <summary>
element supports the list-style
shorthand property and its longhand properties, such as list-style-type
, to change the disclosure triangle to whatever you choose (usually with list-style-image
). For example, we can remove the disclosure widget icon by setting list-style: none
.
CSS
css
details {
font: 16px "Open Sans", Calibri, sans-serif;
width: 620px;
}
details > summary {
padding: 2px 6px;
width: 15em;
background-color: #ddd;
border: none;
box-shadow: 3px 3px 4px black;
cursor: pointer;
list-style: none;
}
details > p {
border-radius: 0 0 10px 10px;
background-color: #ddd;
padding: 2px 6px;
margin: 0;
box-shadow: 3px 3px 4px black;
}
This CSS creates a look similar to a tabbed interface, where activating the tab expands and opens it to reveal its contents.
HTML
html
<details>
<summary>System Requirements</summary>
<p>
Requires a computer running an operating system. The computer must have some
memory and ideally some kind of long-term storage. An input device as well
as some form of output device is recommended.
</p>
</details>
Result
Technical summary
Content categories | Flow content, sectioning root, interactive content, palpable content. |
---|---|
Permitted content |
One <summary> element followed by
flow content.
|
Tag omission | None, both the starting and ending tag are mandatory. |
Permitted parents | Any element that accepts flow content. |
Implicit ARIA role | group |
Permitted ARIA roles | No role permitted |
DOM interface | HTMLDetailsElement |
Specifications
Specification |
---|
HTML Standard # the-details-element |
Browser compatibility
BCD tables only load in the browser