The sbr element to pad up to
The value of the sepchar attribute on the enclosing cmdsynopsis
When processed in this mode, elements output whitespace to the length of the textual output they would normally produce. This allows options to be aligned when explicit line breaks are inserted with sbr elements.
To create the padding for a given sbr element, this mode is called on the enclosing cmdsynopsis element, passing the sbr element. When processed in this mode, elements should only output padding for content the leads up to the sbr element passed in the $sbr parameter. When processing children that don't contain the given sbr element, the $sbr parameter should be set to false() for those children. This avoids additional descendant selectors, which are generally expensive to perform.