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Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
The non-standard -moz-float-edge CSS property specifies whether the height and width properties of the element include the margin, border, or padding thickness.
Formal syntax: border-box | content-box | margin-box | padding-box
-moz-float-edge: border-box -moz-float-edge: content-box -moz-float-edge: margin-box -moz-float-edge: padding-box -moz-float-edge: inherit -moz-float-edge: initial -moz-float-edge: unset
Values
border-box- The height and width properties include the padding and the border but not the margin.
content-box- The height and width properties include the content but not the margin, border and the padding.
margin-box- The height and width properties include the content but not the margin, border and the padding.
padding-box- The height and width properties include the padding but not the margin and the border.
Example
hr {
display: block;
height: 2px;
border: 1px inset;
margin: 0.5em auto 0.5em auto;
color: gray;
-moz-float-edge: margin-box;
box-sizing: border-box;
}