An id on a <caption> tag assigns an identifier to the caption.
The identifier must be unique across the page.
An id attribute on a <caption>.
| Firstname | Lastname | Country |
|---|---|---|
| Vincent | Van Gogh | Netherlands |
| Paul | Cézanne | France |
<style>
table.tb { width:100%; border-collapse: collapse; }
.tb th, .tb td { padding:3px; border: 1px solid #777; }
.tb caption { background-color:lightblue; color:black; padding:5px; text-align:center; }
</style>
<table class="tb">
<caption id="artists">Artists</caption>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Country</th>
</tr>
<tr>
<td>Vincent</td>
<td>Van Gogh</td>
<td>Netherlands</td>
</tr>
<tr>
<td>Paul</td>
<td>Cézanne</td>
<td>France</td>
</tr>
</table>
The id attribute assigns an identifier to the <caption> element.
The id allows JavaScript to easily access the <caption> 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.
<caption 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 (.). |
A <caption> with a unique id.
Clicking the button will display the caption's text.
| Firstname | Lastname | Country |
|---|---|---|
| Vincent | Van Gogh | Netherlands |
| Paul | Cézanne | France |
<section>
<style>
table.tb { width:100%; border-collapse: collapse; }
.tb th, .tb td { padding:3px; border: 1px solid #777; }
.tb caption { background-color:lightblue; color:black; padding:5px; }
</style>
<table class="tb">
<caption id="mycaption">Artists</caption>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>Country</th>
</tr>
<tr>
<td>Vincent</td>
<td>Van Gogh</td>
<td>Netherlands</td>
</tr>
<tr>
<td>Paul</td>
<td>Cézanne</td>
<td>France</td>
</tr>
</table> <br/>
<button onclick="show();">Show caption</button>
</section>
<script>
let show = () => {
let element = document.getElementById("mycaption");
alert("Caption = " + element.innerHTML);
}
</script>
The id attribute assigns a unique identifier to the caption.
Clicking the button calls JavaScript which locates the caption using the id.
Finally, the content of the caption is displayed 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 <caption>
