Web site easter eggs and job ads-in-code are a precursor, http://www.bbc.com/news/technology-25826678 & https://www.smartrecruiters.com/blog/the-5-most-creative-dev...
W3C has an Annotations Group working in this area, which includes commercial companies and educational institutions, http://www.w3.org/2014/04/annotation/report.html
Web site easter eggs and job ads-in-code are a precursor, http://www.bbc.com/news/technology-25826678 & https://www.smartrecruiters.com/blog/the-5-most-creative-dev...
W3C has an Annotations Group working in this area, which includes commercial companies and educational institutions, http://www.w3.org/2014/04/annotation/report.html