An id on a <pre> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on a <pre> element.
SELECT FirstName, LastName FROM Customer ORDER BY LastName
<pre id="pre-sql">
SELECT FirstName, LastName
FROM Customer ORDER BY LastName
</pre>
The id attribute assigns an identifier to the <pre> element.
The id allows JavaScript to easily access the <pre> 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.
<pre 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 <pre> element with a unique id.
Clicking the button displays the content of the element.
SELECT FirstName, LastName FROM Customer ORDER BY LastName
<pre id="mypre">
SELECT FirstName, LastName
FROM Customer ORDER BY LastName
</pre>
<br/>
<button onclick="show();">Show pre content</button>
<script>
let show = () => {
let element = document.getElementById("mypre");
alert("Content = " + element.innerHTML);
}
</script>
The id attribute assigns a unique identifier for the pre.
When the button is clicked, JavaScript locates the pre through the id.
It extracts the <pre> content and displays it 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 <pre>
