The aim of this thesis is to study and compare to what extent Hypertext Markup Language (HTML) and Text Encoding Initiative (TEI) support bibliographic description, metadata and mark-up of textual segments. The projects in the study comprise the Norwegian The Writings of Henrik Ibsen (Henrik Ibsens Skrifter) which applies the use of TEI, and Vitterhet society’s The collected works of CJL Almqvist (Vitterhetssamfundets CJL Almqvist Samlade Verk), which applies the use of HTML. The study showed that the Ibsen project provides its text with bibliographic description and metadata to a greater extent than the Almqvist project. The Almqvist project’s texts are provided with certain information about titles, authors and also information about source material and the electronic edition. However, the markup has proved to be inconsistent – some texts include more information than others do and particular mark words are not used. From the aspect of markup on textual segments, the Ibsen project presented the most detailed information. The amount of mark words used was not only significantly higher in the texts of the Ibsen project, but also more specific. The markup of Almqvist’s texts proved to have been completed by the use of linking, however, the markup showed that TEI offers more possibilities than HTML. In order to comprehend the difference in markup of both projects, an awareness of the respective aims of HTML and TEI should be developed. The two markup languages were created based on two separate kinds of needs, which has contributed to the continual use of both. / Uppsatsnivå: D