Some people get terms wrong, even though they mean something specific that is true.
Here’s a basic glossary of responsive web design:
- “responsive” means the site will adapt to the visiting device, there are a few ways to do this from a technical point of view, the only one that is generally accepted as being superior also for SEO reasons is to do it via so called “CSS media queries”, so all the layouts are baked in CSS and the browser has the ability to follow instructions and pick the layout that works for its current state (essentially window or device width)
- so by using CSS media queries, the site builder implements a “layout switcher”
- for any given layout, the content can stretch to the browser edges or not, if it does it’s called a “fluid” layout, otherwise it’s called a “fixed” layout
- some people conflate “responsive” with “fluid layout switcher”
Currently Sparkle is a hybrid in that it produces a fixed layout switcher, except for full width elements that are fluid.
What that person mean is probably that Sparkle isn’t a 100% fluid layout switcher.