Table Layout in CSS by Eric A. Meyer

Author:Eric A. Meyer
Language: eng
Format: mobi, epub, pdf
Publisher: O'Reilly Media, Inc.
Published: 2016-06-07T16:00:00+00:00

Figure 1-8. The layout of a table row using the collapsing borders model

The specification includes a layout formula that I’ll reproduce here for the benefit of those who enjoy such things:

row width = (0.5 * border-width-0) + padding-left-1 + width-1 + padding-right-1 + border-width-1 + padding-left-2 +...+ padding-right-n + (0.5 * border-width-n)

Each border-width-n refers to the border between cell n and the next cell; thus, border-width-3 refers to the border between the third and fourth cells. The value n stands for the total number of cells in the row.

There is a slight exception to this mechanism. When beginning the layout of a collapsed-border table, the user agent computes an initial left and right border for the table itself. It does this by examining the left border of the first cell in the first row of the table and by taking half of that border’s width as the table’s initial left border width. The user agent then examines the right border of the last cell in the first row and uses half that width to set the table’s initial right-border width. For any row after the first, if the left or right border is wider than the initial border widths, it sticks out into the margin area of the table.

In cases where a border is an odd number of display elements (pixels, printer dots, etc.) wide, the user agent is left to decide what to do about centering the border on the grid line. It might shift the border so that it is slightly off-center, round up or down to an even number of display elements, use anti-aliasing, or adjust anything else that seems reasonable.

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