An id on an <iframe> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on an <iframe> element.
<iframe id="wikiframe" src="https://en.wikipedia.org"
style="height:500px;width:100%;">
</iframe>
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.
<iframe id="identifier" />
| 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 (.). |
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>
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.
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 |
Back to <iframe>
