RapidWeaver Stacks add-on info:

Responder Stack
The Responder is a responsive switch stack, that will show different content for different screen sizes: Typical that is a computer screen, a tablet & a smartphone. The Responder Stack is created with ease & speed in mind. That’s why there’s an option to show the content for the 3 screen sizes side by side or top to bottom… show it the way you like. Save space on your MacBook… There’s custom css areas for all screen sizes + css help at the button of the Stack ControlPanel.

If you go to the example page at the bottom of the screen you'll how you can change content depending on screen size. Resize window to do the magic. If you go to the very bottom of the page you'll see two lines of text when viewed on a computer screen:

All Stacks are downloaded as Zip-files. To install unzip and double click the Stack to install.
Go to the top of the page. Go to the frontpage.

But when viewed on a tablet or smartphone the text will change to 3 lines to avoid an unlucky linebreak.

All Stacks are downloaded as Zip-files.
To install unzip and double click the Stack to install.
Go to the top of the page. Go to the frontpage.

Respond Stack
Dead with text areas and allows you to define the font size, line height and visibility of a text on 6 different screen sizes: 2 x smartphone, 2 x tablets and 2 x computer screen. There's also an option to add custom css to each of the 6 screen sizes. You can adjust all breakpoints to fit text on your RapidWeaver Stacks page exactly the way you want.

Special features:
The Responder Stack allows you to work horizontally to save workspace on your RapidWeaver Stacks page but also has an option to go vertical.

Keywords:
RapidWeaver, stacks, responsive, layout, text, screen sizes, smartphone, tablet, computer