In general English usage, length (symbol: l) is but one particular instance of distance – an object's length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with "distance". Height is vertical distance; width (or breadth) is a lateral distance; an object's width is less than its length. No one speaks of "the length from here to Alpha Centauri", but rather of "the distance from here to Alpha Centauri," but when one speaks of distance more abstractly, one says "A kilometre or a mile, is a unit of length" or "...of distance", and the two statements are synonymous. Likewise, a mountain might be a mile in height. Length is the metric of one dimension of space. The metric of space itself is volume, or (length)3. Length is commonly considered to be one of the fundamental units, meaning that it cannot be defined in terms of other dimensions. However, a set of units can be constructed where units of length can be derived from fundamental physical constants - see Planck units and Planck length.
Colloquially length sometimes refers to duration, especially when used in context of music.
The percentage is calculated with respect to the width of the generated box's containing block.
Calculation of the shrink-to-fit width is similar to calculating the width of a table cell using the automatic table layout algorithm.
In cases where an explicit width or height is set and the other dimension is auto, applying a minimum or maximum constraint on the auto side can cause a conflict between honoring the explicit dimension and honoring the (implicit) aspect ratio.
One approach is to evenly apportion the cell's minimum and maximum width between these columns, another is to weight the apportioning according to the contributions from cells that don't span multiple columns.
This allows the widths of nested tables to be assigned and hence in turn the column widths of such tables.
Note that pixel values for width and height refer to screen pixels, and should be multiplied by an appropriate factor when rendering to very high resolution devices such as laser printers.
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