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outline-width property

Browser support:
Specifies 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 outline-width property is supported in Internet Explorer from version 8.
JavaScript page for this property: outlineWidth. You can find other example(s) there.

Possible values:

 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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