HTML <samp> id Attribute

The id attribute on a <samp> tag assigns an identifier to the sample output element. The identifier must be unique across the page.

Example

#

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>

Using id

The id attribute assigns an identifier to the <samp> element.

The identifier must be unique across the page.

The id allows programmatic access to the <samp> element.

Tip:  id is a global attribute that can be applied to any HTML element.


Syntax

<samp id="identifier" />

Values

#

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 (.).

More Examples

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>

Code explanation

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.


Browser support

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

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