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.
An id on an <em> tag assigns an identifier to the element.
The identifier must be unique across the page.
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>
The id attribute assigns an identifier to the <em> element.
The id allows JavaScript to easily access the <em> 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.
<em id="identifier" />
| 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 (.). |
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>
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.
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 <em>
