HTML <style> id Attribute

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

Example

#

An id attribute on a <style> element.

Claude Monet

Oscar-Claude Monet was a French painter, a founder of French Impressionist painting and the most consistent and prolific practitioner of the movement's philosophy of expressing one's perceptions before nature, especially as applied to plein air landscape painting.

<style id="styles">
   .turquoise { color: #1b6b6f; }
   .soft-turquoise-bg { background-color: #eafafb; padding:15px 0;}
</style>

<article>
  <h3 class="turquoise">Claude Monet</h3>
  <p class="soft-turquoise-bg">
     Oscar-Claude Monet was a French painter, a founder of 
     French Impressionist painting and the most consistent 
     and prolific practitioner of the movement's philosophy 
     of expressing one's perceptions before nature, especially 
     as applied to plein air landscape painting.
  </p>
</article>


Using id

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

The identifier must be unique across the page.

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

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


Syntax

<style 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 <style> tag with a unique id.
Clicking the button displays the CSS rules of the style.

Claude Monet

Oscar-Claude Monet was a French painter, a founder of French Impressionist painting and the most consistent and prolific practitioner of the movement's philosophy of expressing one's perceptions before nature, especially as applied to plein air landscape painting.


<style id="mystyles">
   .indigo{ color: #3630a3; }
   .soft-indigo-bg { background-color: #f6f8ff; padding:15px 0;}
</style>

<article>
  <h3 class="indigo">Claude Monet</h3>
  <p class="soft-indigo-bg">
     Oscar-Claude Monet was a French painter, a founder of 
     French Impressionist painting and the most consistent 
     and prolific practitioner of the movement's philosophy 
     of expressing one's perceptions before nature, especially 
     as applied to plein air landscape painting.
  </p>
</article>

<br />
<button onclick="show();">Show style content</button>

<script>
  let show = () => {
     let element = document.getElementById("mystyles");
     alert("Content = " + element.innerHTML);
  }
</script>

Code explanation

The id attribute assigns a unique identifier for the <style>.

Clicking the button calls JavaScript which locates the <style> using the id.

Finally, the content of the <style> 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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