HTML <iframe> style Attribute

The style attribute on an <iframe> tag assigns a unique style to the inline frame. A style contains one or more CSS property/value pairs that define the appearance of the iframe element.



A style attribute on an <iframe> element.

<iframe src=""
        style="border:4px solid teal;height:450px;width:100%;">

Using style

The style attribute specifies the style, i.e. look and feel, of the <iframe> element.

A style contains any number of CSS property/value pairs, separated by semicolons (;).

The style attribute overrides any other style that was defined in a <style> tag or an external CSS file.

This inline styling affects the current <iframe> element only.


<iframe style="CSS-styles">



Value Description
CSS-styles One or more CSS property/value pairs separated by semicolons (;).

More Examples

A style attribute on an <iframe> element.
Clicking the button toggles the border color.

<iframe id="myiframe"
        style="border:4px solid teal;height:450px;width:100%;">

<br /><br />
<button type="button" onclick="toggle();">Toggle style</button>

  let toggle = () => {
    let element = document.getElementById("myiframe");

    if ( === "teal") { = "tomato";
    } else { = "teal";

Code explanation

The style attribute assigns a border to the <iframe> element.

Repeatedly clicking the button calls JavaScript that changes the border color.

Browser support

Here is when style support started for each browser:

1.0 Sep 2008
1.0 Sep 2002
1.0 Aug 1995
1.0 Jan 2006
1.0 Jan 2003

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