An id on a <samp> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on a <samp> element.
The program ran for 3.5 minutes. Here is the output:
*** The first 50 digits of pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 ***
<p>The program ran for 3.5 minutes. Here is the output:</p>
<samp id="samp-id">
*** The first 50 digits of pi are: 3.1415926535 8979323846
2643383279 5028841971 6939937510 ***
</samp>
The id attribute assigns an identifier to the <samp> element.
The id allows JavaScript to easily access the <samp> 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.
<samp 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 <samp> tag with a unique id.
Clicking the button displays the sample content.
The program ran for 3.5 minutes. Here is the output:
*** The first 50 digits of pi are: 3.1415926535 8979323846 2643383279 5028841971 6939937510 ***<p>The program ran for 3.5 minutes. Here is the output:</p>
<samp id="mysamp">
*** The first 50 digits of pi are: 3.1415926535 8979323846
2643383279 5028841971 6939937510 ***
</samp>
<br />
<button onclick="show();">Show sample content</button>
<script>
let show = () => {
let element = document.getElementById("mysamp");
alert("Content = " + element.innerHTML);
}
</script>
The id attribute assigns a unique identifier for the <samp>.
Clicking the button calls JavaScript which locates the <samp> through the id.
Finally, the content of the <samp> 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 |
Back to <samp>
