Open
Description
It's inconvenient that on each page the participants have to open the system-specific (e.g. Linux, Windows, OS X) dropdowns manually. Sometimes they forget about opening one of them, thus they fail to run a crucial command which breaks things later.
My recommendation: Add JavaScript to auto-detect the operating system used, and auto-open the system-specific dropdowns.
My additional recommendation: Add buttons (links) to open all all dropdowns for a specific system. This should apply to all pages of the tutorial.
My additional recommendation: If the user manually opens a dropdown, all other dropdowns with the same system should auto-open, or there should be a link displayed which can be used to open all of them.