ryan neptune

@alanhogan Sure it's `ryanve at gmail` if you want, or post the link if it's online. I think I can imagine but it's always good to see exactly how stuff...

[jsfiddle.net/zmU9n/12/](http://jsfiddle.net/zmU9n/12/) shows this issue in the console. Locally I was able to trace the issue to something that changed between [0.7.1 and 0.7.2](../compare/0.7.1...0.7.2). Revert to [0.7.1](../tags) until we fix this....

It is. The issue only occurs when **aliases** (extra prefixes) are specified. Removing the aliases solves it. [/13](http://jsfiddle.net/zmU9n/13/) and (better) [/15](http://jsfiddle.net/zmU9n/15/) both work. The extra keys are throwing off the...

Correct—you can use any prefix you want, and you only need one. The aliases [were added in 0.3](../blob/master/CHANGELOG.md) to accomodate back-compat. with earlier versions. They add flexibility but are best...

Are there errors in the console? What is your `Response.create()` (or `[data-responsejs]`) configuration? It sounds like an issue with the [configuration](../wiki/how-to-create-breakpoint-sets).

- To run code after the initial change, run it either or after your `Response.create()` setup or if using only `[data-responsejs]` to setup then immediately after the response.js file runs....

That error comes from [this check](../blob/0.8.0/response.js#L13-L17). `jQuery` was not found when response.js ran. `jQuery` ([or a compatible lib](../blob/0.8.0/response.js#L8)) must exist in the global scope at the time that response.js runs....

I advise _against_ polyfilling media queries because doing so makes your media queries unreliable. Instead use [mobile-first media queries](http://bradfrostweb.com/blog/post/7-habits-of-highly-effective-media-queries/) such that IE8 gets the [unenhanced](http://en.wikipedia.org/wiki/Progressive_enhancement) version. [IE8 is obsolete](http://windows.microsoft.com/en-us/windows/end-support-help).

[response.js](../) is not a [polyfill](http://en.wikipedia.org/wiki/Polyfill) and does not use any. You seem confused with [respond](https://github.com/scottjehl/Respond). I mentioned polyfills because your page was using [css3-mediaqueries](https://github.com/livingston/css3-mediaqueries-js) to polyfill media queries. Polyfill and...

It's not really designed for use with background images. You can use normal [CSS media queries](https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries) to set different background images at different breakpoints as needed.