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HTML <iframe> id Attribute

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

The identifier must be unique across the page.

Example

#

An id attribute on an <iframe> element.

<iframe id="wikiframe" src="https://en.wikipedia.org"
        style="height:500px;width:100%;">
</iframe>

Using id

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

The id allows JavaScript to easily access the <iframe> 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

<iframe id="identifier" />

Values

#

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

More Examples

An <iframe> element with a unique id.
Clicking the button will display the src value of the frame.



<iframe id="myframe" src="https://en.wikipedia.org" 
        style="height:500px;width:100%;">
</iframe>
  
<br/><br/>
<button onclick="show();">Show iframe source</button>

<script>
  let show = () => {
    let frame = document.getElementById("myframe");
    alert("Src = " + frame.src);
  }
</script>

Code explanation

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

Clicking the button calls JavaScript which locates the <iframe> using the id.

Finally, the src value of the <iframe> is displayed in an alert box.


Browser support

Here is when id support started for each browser:

Chrome
1.0 Sep 2008
Firefox
1.0 Sep 2002
IE/Edge
1.0 Aug 1995
Opera
1.0 Jan 2006
Safari
1.0 Jan 2003

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