The aim of this study was to determine secondary school students' choice of design features for digital textbooks. As a part of the research--which was conducted using a mixed technique--a literature review was carried out to source points to consider in the designing of digital textbooks and experts' opinions were obtained. Based on the results, an 88-question survey was then developed to elicit the preferences of secondary school students with regard to design features for digital textbooks. Also, in this study, three digital textbooks with different design features--but with the same content--were developed to be used by the students. The students were then informed about digital textbook technology by researchers and the digital textbooks were made available to them. Finally, the survey was administered in four separate sessions, and the results were revealed by analysis of the data collected. The findings showed that students would rather see digital books with a front page, back page and bookplate. They also pointed out that elements for switching between pages are necessary along with the table of contents, index, glossary and search tools. Lastly, they expressed a desire for images in digital textbooks, especially three-dimensional lifelike drawings, videos and animations.