IFrame width Property

Change the width of an iframe:

document.getElementById("myFrame").width = "400";

Description

The width property sets or returns the value of the width attribute in an iframe element.

The width attribute specifies the width of an iframe.

Tip: Use the height property to set or return the value of the height attribute in an iframe.

Property
width	Yes	Yes	Yes	Yes	Yes

Return the width property:

iframeObject.width

Set the width property:

iframeObject.width = pixels

Value	Description
pixels	The width in pixels (like "100px" or just "100")

Return Value:	A String, representing the width of the iframe, in pixels

Return the width of an iframe:

var x = document.getElementById("myFrame").width;

Change the height and width of an iframe:

document.getElementById("myFrame").height = "400";
document.getElementById("myFrame").width = "400";