org: Links in HTML export

 
 12.6.5 Links in HTML export
 ---------------------------
 
 Internal links (SeeInternal links) will continue to work in HTML.
 This includes automatic links created by radio targets (SeeRadio
 targets).  Links to external files will still work if the target file
 is on the same relative path as the published Org file.  Links to other
 ‘.org’ files will be translated into HTML links under the assumption
 that an HTML version also exists of the linked file, at the same
 relative path.  ‘id:’ links can then be used to jump to specific entries
 across files.  For information related to linking files while publishing
 them to a publishing directory see SeePublishing links.
 
    If you want to specify attributes for links, you can do so using a
 special ‘#+ATTR_HTML’ line to define attributes that will be added to
 the ‘<a>’ or ‘<img>’ tags.  Here is an example that sets ‘title’ and
 ‘style’ attributes for a link:
 
      #+ATTR_HTML: :title The Org mode homepage :style color:red;
      [[http://orgmode.org]]