Few days ago i came to know about CSS outline property and i thought how it is different from border property. According to W3Schools “An outline is a line that is drawn around elements (outside the borders) to make the element ‘stand out’ “. W3C says outline differ from border in the following ways (ref: http://www.w3.org/TR/CSS2/ui.html): Outlines do not take up space. Outlines may be non-rectangular. Outlines do not take up space Yes outline do not take up space, but how something can be placed in a web page without taking any space? It is similar to place an element over another using z-index, so outline does not take up any space because it is places on the top an the element. The size of any element before putting outline is same as that of the size of that element after putting outline. So outline does not add any extra space and does not change the element’s size or postion.
While border takes extra space and is added to the outer part of an element.
Outlined Image
Bordered Image
Outlines may be non-rectangular: It does not mean that you can create rounded outlines. When we add outline to an element then when the text inside the outlined area wraps, the box is closed and then reopened in the new line.
But in case of border, the entire element is treated as a rectangular box which is split over several lines until it is closed.
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Apart from the above two differences, one more difference is there between border and outline, which is:
Outlines can have offset
Outline has a property called offset, which allows the outline to be moved further inside or outside of the element. Both border and outline has been applied to the content below.
.element
{
border: 1px solid #7B7F00;
outline: 1px solid #7B7F00;
outline-offset: -10px;
}
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Hope this will help you : )
Thanks