An id on an <img> tag assigns an identifier to the image.
The identifier must be unique across the page.
An id attribute on an <img> element.
<img id="image-vangogh"
src="/img/html/vangogh.jpg"
alt="Van Gogh, Self-portrait">
The id attribute assigns an identifier to the <img> element.
The id allows JavaScript to easily access the <img> 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.
<img 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 <img> tag with a unique id.
Clicking the button displays the image url.
<img id="myimg"
src="/img/html/poppies.jpg"
alt="Van Gogh, Poppies">
<br/><br/>
<button onclick="show();">Show image src</button>
<script>
let show = () => {
let img = document.getElementById("myimg");
alert("Src = " + img.src);
}
</script>
The id attribute assigns a unique identifier for the <img> element.
Clicking the button calls JavaScript which locates the <img> using the id.
Finally, the src value of the <img> 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 <img>
