HTML <summary> id Attribute

HTML <sub>

HTML <sup>

An id on a <summary> tag assigns an identifier to the element.

The identifier must be unique across the page.

Example

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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

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

The id allows JavaScript to easily access the <summary> element.

It is also used to point to a specific id selector in a style sheet.

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

Syntax

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<summary id="identifier" />

Values

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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

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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

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Here is when id support started for each browser: