About Margin Properties
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Color/Background Properties
margin | margin-top | margin-right
margin-bottom | margin-left

What Do They Do?
In CSS, the fundamental visual rendering model places all components of the document tree in physical and virtual rectangular boxes, each having a specific height and width. An element's rendering box consists primarily of an element's content at the center (text, images, etc.) Surrounding the element's content (moving outward in rectangular layers/strips) are optional padding, surrounded by any optional border effects, surrounded in turn by any optional margin values that may be specified.

The margin properties allow the author to specify how much space will be inserted between other exterior elements and the current element border. Negative values may be used with margin properties to create overlapping content.

Each side of the margin dimensions (top, right, bottom and left) can be addressed and controlled independently using separate properties, or a convenient shorthand notation may be used that controls multiple sides at once.
Related Sites
Official Reference: CSS Level 1, Sections 5.5.1-5
5.5.5: 'margin'
5.5.1: 'margin-top'
5.5.2: 'margin-right'
5.5.3: 'margin-bottom'
5.5.4: 'margin-left'
Official Reference: CSS Level 2, Section 8.3
8.3: 'margin',
8.3: 'margin-top'
8.3: 'margin-right'
8.3: 'margin-bottom'
8.3: 'margin-left'


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