HTML <b> id Attribute

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

Example

#

An id attribute on a <b> element.

Cézanne's early work is often concerned with the figure in the landscape and includes many paintings of groups of large, heavy figures in the landscape, imaginatively painted.

<article>
 <p>
  Cézanne's <b id="early-work">early work</b> is often concerned with the figure 
  in the landscape and includes many paintings of groups of large, 
  heavy figures in the landscape, imaginatively painted. 
 </p>
</article>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<b id="identifier" />

Values

#

Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([b-Zb-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

A <b> tag with a unique id.
Clicking the button displays the text inside the bold element.

Cézanne's early work is often concerned with the figure in the landscape and includes many paintings of groups of large, heavy figures in the landscape, imaginatively painted.


<article>
  <p>
   Cézanne's <b id="early">early work</b> is often concerned with the figure 
   in the landscape and includes many paintings of groups of large, 
   heavy figures in the landscape, imaginatively painted. 
  </p>
</article>

<br />
<button onclick="show();">Show bold text</button>

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

Code explanation

The id attribute assigns a unique identifier to the <b> element.

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

Finally, the content of the 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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