The html-dokumentation for the tutorials is prepared in docbook. This allows generation of html or pdf as needed. Extensions wit stylesheets are possible. Extensions are used to implement the small resistor graphics inline the text. Or they can be used to build task lists.
Docbook separates content and presentation. Conversion to other authoring systems is possible, as xml is used for the content.
Blog pages are wordpress-based, if someone has knowledge on using docbook as input for wordpress then please drop be a note.
For the school computers I prefer midori for browsing. This tool has the nice feature to enlarge graphics with 'show image in new tab'. Epiphany is not having this feature..