John wrote:
In the CSS box model, are background images understood to occupy the same height and width as the outer edge of the border area?


thank you

John


No, this is only true for background-color which covers the whole border box, whatever it's dimensions. For background-image, the image can only occupy the same height and width of the border box if the image has a background-size (in both x and y axis) of 100% and the value for background-origin is border [1].

Please remember that a box could have a border or not have a border. The absence of a border means the context box and border box are the same and any reference would be to the border box when pertaining to background.

The same applies with a box without padding. The absence of padding and a border means the padding box, context box and border box are the same and any reference would be to the border box when pertaining to background.


1. <http://css-class.com/test/css/backgrounds/background-origin1.htm>



--
Alan http://css-class.com/

Armies Cannot Stop An Idea Whose Time Has Come. - Victor Hugo
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