|previousSibling |`yes` means the block is before this node, in parent node's children list, else it means the block is this node's direct parent node. |
<<wikitext-example-without-html """The block id widget is invisible, and is usually located at the end of the line. ID is here:<$blockmark id="BlockLevelLinksID1"/>
<<wikitext-example """You can refer to the block that is a line before the block id widget. Make sure block id widget itself is in a block (paragraph).