HTML DOM Frameset cols Property

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# Frameset cols Property

Frameset Object

## Definition and Usage

The cols property sets or returns the value of the cols attribute in a frameset.

The cols attribute specifies the size of, and the number of frames in a frameset. Each frame’s width is specified in a comma-separated list.

## Syntax

framesetObject.cols=values

The cols property can have one or more of the following values:

Value | Description
--- | ---
pixels | The column size in pixels (like "100px" or just "100")
% | The column size in percent of the available space (like "50%")
* | The rest of the available space should be assigned this column

## Browser Support

The cols property is supported in all major browsers.

## Example

Create a frameset with two columns. Each column is set to 50% of the browser window:

<html>
<frameset id="main" cols="50%,50%">
<frame src="frame_cols.htm">
<frame src="frame_a.htm">
</frameset>
</html>

The source code of "frame_cols.htm" is as follows:

## Example

<html>
<head>
<script>
function changeCols()
{
parent.document.getElementById("main").cols="30%,70%"
}
function restoreCols()
{
parent.document.getElementById("main").cols="50%,50%"
}
</script>
</head>
<body>
<input type="button" onclick="changeCols()" value="Change column size">
<input type="button" onclick="restoreCols()" value="Restore column size">
</body>
</html>
Try it yourself »

Frameset Object

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