HTML <em> id Attribute

The id attribute on an <em> tag assigns an identifier to the emhasis element. The identifier must be unique across the page.

Example

#

An id attribute on an <em> element.

Many of Matisse's paintings from 1898 to 1901 make use of a Divisionist technique. Divisionism is a paint style that is defined by the separation of colors into individual dots which interact optically.

<article>
  <p>
    Many of Matisse's paintings from 1898 to 1901 make use 
    of a <em id="divisionist">Divisionist</em> technique.
    Divisionism is a paint style that is defined by the separation
    of colors into individual dots which interact optically.
  </p>
</article>

Using id

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

The identifier must be unique across the page.

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

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


Syntax

<em id="identifier" />

Values

#

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

More Examples

An <em> element with a unique id.
Clicking the button displays the content of the element.

Many of Matisse's paintings from 1898 to 1901 make use of a Divisionist technique. Divisionism is a paint style that is defined by the separation of colors into individual dots which interact optically.

<article>
  <p>
    Many of Matisse's paintings from 1898 to 1901 make use 
    of a <em id="myem">Divisionist</em> technique.
    Divisionism is a paint style that is defined by the separation
    of colors into individual dots which interact optically.
  </p>
</article>

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

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

Code explanation

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

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

It extracts the element's content which is then display 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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