An id on a <param> tag assigns an identifier to the element.
The identifier must be unique across the page.
An id attribute on a <param> tag.
<object data="/media/contract.pdf"
style="width:100%;height:350px;">
<param id="pdf-param" name="type" value="application/pdf" />
</object>
The id attribute assigns an identifier to the <param> element.
The id allows JavaScript to easily access the <param> 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.
<param id="identifier" />
| 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 (.). |
A <param> element with a unique id.
Clicking the button displays the value of the parameter.
<section>
<object data="/media/contract.pdf" width="100%" height="350">
<param id="myparam" name="type" value="application/pdf" />
</object>
<br/><br/>
<button onclick="show();">Show param value</button>
</section>
<script>
let show = () => {
let element = document.getElementById("myparam");
alert("Value = " + element.value);
}
</script>
The id attribute assigns a unique identifier for the <param>.
Clicking the button calls JavaScript which locates the <param> using the id.
Finally, the value of the <param> 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 |
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