Opera Software welcomes interest in books based on core web standards and plans to participate at the Workshop on eBooks. As a browser vendor, HTML and CSS has been our staple food for the past 16 years. In that period, most of our efforts have gone into improving the web experience on people's screens. In order for web content to be scalable across a wide range of devices, it is important to have presentational tools that adapt to the user's enviorment. Opera staff has been editors of these CSS specifications that are particularly relevant to the adaptive presentation of content: - CSS3 Multicol - Media Queries - CSS3 Paged Media - CSS3 Generated Content for Paged Media (GCPM) In order to do electronic books compelling on screens, we believe browsers must support pagination. In 2011 we implemented pagination of common web content, and added gesture-based navigation between pages and documents. Using this feature, authors can easily repurpose web content for book-like presentations by adding a few lines of CSS to their code. The technical solution is proposed in the GCPM specification. In order for the web to compete with native applications, we believe it is important that onscreen page-based presentations are added to web designers' toolbox. Given this functionality, extending current browsers to support common ebook formats like epub and fb2 is fairly easy. We will be able to demo our implementation at the workshop. Also, GCPM describes many book-oriented features that have been implemented by batch processors, including: footnotes, running headers and footers, leaders, page-based floats, and bookmarks. These features can also be presented and demo'ed at the workshop.