Great work Ignacio! Works perfectly.
This is probably on your list, but one thing I would suggest is to have the screen size where the swap occurs (currently 'small') configurable in the articles.json part. I opened the JS and changed
const sizedInstruction = (device.screenSize === 'small'... etc to
'medium' (which I needed because my tabbed abs collapses @device-width-medium, so the 'Click the tabs...' instruction needs to change) but for someone petrified of code (even more than me!) it might help!
Works great though! Many thanks.