An id on a <li> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on 3 <li> elements.
<ol>
<li id="designers">Designers</li>
<li id="developers">Developers</li>
<li id="managers">Managers</li>
</ol>
The id attribute assigns an identifier to the <li> element.
The id allows JavaScript to easily access the <li> 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.
<li 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 (.). |
An id attribute on the first <li> element.
Clicking the button will display the text of the first list item.
<ol>
<li id="myli">Designers</li>
<li>Developers</li>
<li>Managers</li>
</ol>
<br />
<button onclick="show();">Show first item</button>
<script>
let show = () => {
let element = document.getElementById("myli");
alert("Item = " + element.innerHTML);
}
</script>
The id attribute assigns a unique identifier to the first <li> element.
Clicking the button calls JavaScript which locates the <li> using the id.
Finally, the content of the <li> element 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 |
