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dialogWidth property (window)

Browser support:
Specifies or retrieves the width of the dialog window.
This property is only supported by windows that were created via the window.showModalDialog or window.showModelessDialog method.


You can find the related objects in the Supported by objects section below.
This property is read/write.

Possible values:

String that sets or retrieves a floating-point number followed by a unit designator (cm, mm, in, pt, or pc, em, ex, or px).
Default: this property has no default value.

Example HTML code 1:

This example illustrates the use of the dialogWidth property:
    <script type="text/javascript">
        function ShowModal () {
            if (window.showModalDialog) {
                window.showModalDialog ("dial_geom.htm", null, 
                                        "dialogWidth:300px; dialogHeight:200px; dialogLeft:310px; dialogTop:210px;");
            else {
                alert ("Your browser does not support this functionality!");
    <button onclick="ShowModal ()">Show modal dialog!</button>
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