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outline-offset property

Browser support:
Sets the amount of space between the outline and the border or the edge of the element.
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.
JavaScript page for this property: outlineOffset. 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.
space in length
The space in length units. For the supported length units, see the length page.
Default: none.

Example HTML code 1:

This example illustrates the use of the outline-offset property:
        .example {
            outline-width: 2px;
            outline-style: solid;
            outline-color: blue;
            border: 1px solid black;
            width: 200px;
        .offset5px {
            outline-offset: 5px;
        .offset20px {
            outline-offset: 20px;
    <div class="example offset5px">outline-offset: 5px</div>
    <br /><br /><br />
    <div class="example offset20px">outline-offset: 20px</div>
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