* Below is an illustration of the various directions and terms as applied to a flex
* container with the "flex direction" defined as "row".
*
+ * @code
* flex container
* --------------------------------------------------------------- cross start
* | ------------------ --------|--------------------------- |
* | | | | | | |
* | | | | | | |
- * | | flex item 1 | | | flex item 2 | | main axis
+ * | | flex item 1 | | | flex item 2 | | main axis
* |-|----------------|-|-------|--------------------------|-|------------>
* | | | | | | |
* | | | | | | |
* | main start | cross axis | main end
* | | |
* v
+ * @endcode
*
* @nosubgrouping
* <h3>Per-child Custom properties for script supporting:</h3>