Template:diagonal split header

The following documentation is located at Template:diagonal split header/documentation.

Useful links: subpage list • links • redirects • transclusions • errors (parser/module) • sandbox

This template simulates a table header cell split diagonally, a device often used to compactly label headers of rows and columns, as in this example:

To use it, create a header cell using ! followed by {{diagonal split header|NATURE-OF-ROW-HEADERS|NATURE-OF-COLUMN-HEADERS}}.

As the effect is achieved by drawing a diagonal line across the cell, the two headers are still part of the same cell and can easily overrun the line. A remedy is to pad the headers with non-breaking spaces ( ), line breaks (<br>), and/or CSS (escape = signs as {{=}}), as in the example above.

For example, if a header "Header" is overrunning the line at the end of the word, it can be marked up like this: <span style{{=}}"padding-right: 2em;">Header</span>. If it is overrunning the line at the beginning of the word, use <span style{{=}}"padding-left: 2em;">Header</span>. To reduce the size of the header text, add font-size: 85%; to the span statement (this is equivalent to {{small}}), and to make the header text bold add font-weight: bold;.

The template user is responsible for checking that headers do not overrun on common Web browsers.

{| class="wikitable"
! {{diagonal split header|From|To}}
! Solid !! Liquid !! Gas
|-
! Solid
| Solid-solid transformation || Melting || Sublimation=
|}

A third parameter can be added to change the background colour from the standard header cell colour. Changing it to transparent (or another colour such as white, or #ffffff) lets the template be applied to non-header cells.

You may also indicate a second color in the fourth parameter (its default is the same as the third parameter), the first color being used for the lower left half of the cell, the second color being used for the upper right half of the cell.

Prefix it with | for data cells instead of ! for header cells, as in this Friend or Foe? payoff matrix:

Example

Code

{| class="wikitable" style="margin:0 auto;text-align:center;"
! {{diagonal split header| Pair 1 | {{color|#900|Pair 2}} | cyan | yellow}}
! style="width:6em;background:yellow;"| {{color|#900|"Friend" (cooperate)}}
! style="width:6em;background:yellow;"| {{color|#900|"Foe" (defect)}}
|-
! style="width:6em;background:cyan "| "Friend" (cooperate)
| {{diagonal split header| 1 | {{color|#900|1}} | transparent}}
| {{diagonal split header| 0 | {{color|#900|2}} | pink | palegreen}}
|-
! style="width:6em;background:cyan "| "Foe" (defect)
| {{diagonal split header| 2 | {{color|#900|0}} | palegreen | pink}}
| {{diagonal split header| 0 | {{color|#900|0}} | pink}}
|}

The template is compatible with collapsible tables, and cells using colspan or rowspan, in which case place the colspan/rowspan attribute between ! and {{diagonal split header 2 ...}}. It is not compatible with sortable tables, as the sort arrows are not drawn, but this problem can be resolved by using a second header row.

• It is possible to create a version without the line-overrun per Krautzberger. This one works by drawing a line and using a 2x2 CSS grid with the bottom-left and top-right corners.

  See caniuse for support of the required css-grid feature; compare with (unprefixed) css-gradients underlying the current implementation.

• Neither implementation supports laying out text along the diagonal, as the browser is unaware of the triangular shape. CSS-shapes may be a solution, but the easier shape-inside approach is yet to be standardized.