Title text:
Turning in other directions can be accomplished by using a magnetized centerboard and ocean currents, since a current flowing through a magnetic field induces a Laplace force.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3090/
I guess this is going to come down to desktop vs mobile preference. On mobile this shows everything on one page with no additional loading. Alternatively, using the source page requires multiple steps and page loads for mobile users, who may also need to amend the link to see the hover text.
In that case, perhaps linking to the mobile site would make sense, since it ought to work for both mobile and desktop:
https://m.xkcd.com/3090/