HTML <summary> id Attribute

The id attribute on a <summary> tag assigns an identifier to the disclosure summary element. The identifier must be unique across the page.

Example

#

An id attribute on a <summary> tag.

Order 4A801

You sold 125 shares of MSFT at 11:29 AM

You bought 200 shares of GOOG at 11:26 AM

<details>
  <summary id="trade-summary">Order 4A801</summary>
  <p>You sold 125 shares of MSFT at 11:29 AM</p>
  <p>You bought 200 shares of GOOG at 11:26 AM</p>
</details> 

Using id

The id attribute assigns an identifier to the <summary> element.

The identifier must be unique across the page.

The id allows programmatic access to the <summary> element.

Tip:  id is a global attribute that can be applied to any HTML element.


Syntax

<summary id="identifier" />

Values

#

Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

A <summary> element with a unique id attribute.
Clicking the button displays the content of the element.

Order 4A801

You sold 125 shares of MSFT at 11:29 AM

You bought 200 shares of GOOG at 11:26 AM


<details>
  <summary id="mysummary">Order 4A801</summary>
  <p>You sold 125 shares of MSFT at 11:29 AM</p>
  <p>You bought 200 shares of GOOG at 11:26 AM</p>
</details> 
  
<br />
<button onclick="show();">Show summary content</button>

<script>
  let show = () => {
     let element = document.getElementById("mysummary");
     alert("Content = " + element.innerHTML);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <summary>.

Clicking the button calls JavaScript which locates the <summary> through the id.

Finally, the content of the <summary> is displayed in an alert box.


Browser support

Here is when id support started for each browser:

Chrome
12.0 Jun 2011
Firefox
48.0 Aug 2016
IE/Edge
Not supported
Opera
15.0 May 2013
Safari
6.0 Jul 2012

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