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outlineWidth style property

Browser support:
Specifies or returns the width for an element's outline.
The outline is similar to the border of an element, but it is not part of the element's dimensions, and it is displayed around the margin of the element. Therefore the element's width and height properties do not contain the width of the outline.
Note: The outlineWidth property is supported in Internet Explorer from version 8.


You can find the related objects in the Supported by objects section below.
This property is read/write.
CSS page for this property: outline-width

Possible values:

The type of this property is string.
 One of the following values: 
Takes the value of this property from the computed style of the parent element.
outline width in non-negative length
The width of the outline in length units. For the supported length units, see the length page.
Greater than the medium width.
Less than the medium width.
Default: medium.

Example HTML code 1:

This example illustrates the use of the outline-width property:
        .example {
            outline-width: 2px;
            outline-style: solid;
            outline-color: blue;
    <div class="example">Outline: 2px solid blue</div>
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Example HTML code 2:

This example illustrates the use of the outlineWidth property in JavaScript:
    <script type="text/javascript">
        function ChangeOutline (selectTag) {
            // Returns the index of the selected option
            var whichSelected = selectTag.selectedIndex;

            // Returns the text of the selected option
            var widthValue = selectTag.options[whichSelected].text;

            var div = document.getElementById ("myDiv");

            if ('outlineWidth' in {
       = widthValue;
            } else {
                alert ("Your browser doesn't support this example!");
    <div id="myDiv" style="outline: 4px solid blue;">Change outline width</div>

    <br /><br /><br />

    <select onchange="ChangeOutline (this);" size="8">
        <option />1px
        <option />2px
        <option selected="selected" />4px
        <option />6px
        <option />8px
        <option />10px
        <option />15px
        <option />25px
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Supported by objects:

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