TLDR; Emmet Re:view is a useful Chrome extension for responsive layout testing
During my search for responsive testing tools I found Emmet Re:view, and reviewed it.
- Emmet Re:View on chrome store
Emmet Re:View matches some of my requirements for responsive testing but mainly it offers a potential time saving time of showing many different sizes at the same time.
I wrote a crude tool many moons ago for responsive layout testing - it uses iframes and is a bit clunky.
Emmet Re:view runs as a chrome extension and can show a page as multiple sizes at the same time.
You can configure the set of renderings used.
And the page is scrolled at the same rate so you can see much of the same content in each view at the same time.
Unfortunately I couldn’t get the media query breakpoints view to work, but the multiple rendering view is useful enough to consider using this plugin for.