These macros generate a a three-column grid of items in online
documentation.
These make for a clutter-free and more visually pleasing result
in many cases, compared to a standard \table layout.
For compatibility reasons, these macros continue to output a table
structure in offline documentation builds.
Task-number: QTWEBSITE-1144
Change-Id: Iab994b383f488dbd225c6a04d64cf41e2dbb20e9
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
(cherry picked from commit a65314d5da0176224279c11398ff3c76b4cf6878)
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
e880bf86fe