An id on a <summary> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on a <summary> tag.
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>
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.
<summary id="identifier" />
| 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 (.). |
A <summary> element with a unique id attribute.
Clicking the button displays the content of the element.
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>
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.
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 |
Back to <summary>
