...Concealing is set for some syntax such as bold, italic, code block and link. Concealing lets you conceal text with other text. The actual source text is not modified. If you put your cursor on the concealed line, the conceal goes away. This tells vim-markdown whether to attempt to follow a named anchor in a link or not. When it is 1, and only if a link can be split in two parts by the pattern '#', then the first part is interpreted as the file and the second one as the named anchor. This also includes urls of the form #anchor, for which the first part is considered empty, meaning that the target file is the current one. ...