WindowSize is a really simple module that adds a small widget to the top of your screen that dynamically displays your browser’s width and height. I wrote a patch for it that I am hoping you can help test in order to push the module towards a final approved version.
Unfortunately, the module is still in development and it is not yet so user friendly. Currently, after you install it, you get the widget in the top-left corner of your screen without the possibility to move it or even turn it on or off. To make it go away, you need to disable the whole module. I think there is great potential in this project, as responsive themers need this kind of things.
I often have to use outside resources to test breakpoints and it gets annoying to keep having to resort to that. So i wrote a quick patch, and intend to spend a bit more time on this module to try to improve its usability. What I now added is a simple on/off toggle functionality that can be found in the general theme settings (under Appearance). You can find my patch in the issue queue.
This is a basic thing, but I think more can be done: making the widget draggable, toggling it on/off right there on the screen etc. I call on you to come up with great ideas and possibly even help the maintainer build a great module out of this.
Danny founded WEBOMELETTE in 2012 as a passion project, mostly writing about Drupal problems he faced day to day, as well as about new technologies and things that he thought other developers would find useful. Now he now manages a team of developers and designers, delivering quality products that make businesses successful.