From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/html/element%2Fdetails.html | 249 ++++++++++++++++++++++++++++++++++++ 1 file changed, 249 insertions(+) create mode 100644 devdocs/html/element%2Fdetails.html (limited to 'devdocs/html/element%2Fdetails.html') diff --git a/devdocs/html/element%2Fdetails.html b/devdocs/html/element%2Fdetails.html new file mode 100644 index 00000000..cdb95c37 --- /dev/null +++ b/devdocs/html/element%2Fdetails.html @@ -0,0 +1,249 @@ +

<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 display: list-item to the <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

+
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariWebView AndroidChrome AndroidFirefox for AndroidOpera AndroidSafari on IOSSamsung Internet
details1279
49Before Firefox 57, there was a bug meaning that <details> elements can't be made open by default using the open attribute if they have a CSS animation active on them.
No1564.418
49There is a bug meaning that <details> elements can't be made open by default using the open attribute if they have a CSS animation active on them.
1461.0
name120120NoNoNoNoNoNoNoNoNoNo
open127949No1564.418491461.0
+

See also

+
+

+ © 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
+ https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details +

+
-- cgit v1.2.3