This is an interesting tool: mess around with styles on any site inside Chrome’s dev tools, and then hit a button to have the updated styles saved to a URL (a Gist on Github).
A step-by-step guide to implementing drag’n’drop, and image previews with the Filereader API. No libraries or frameworks were harmed in the making of this article.
Well, that escalated quickly! Service workers are now available in Safari’s Technology Preview, which means it won’t be long before it lands in Safari proper.
Everything offline’s coming up Milhouse!
This looks like it could be one alternative to Adobe Shadow or Edge Inspect or whatever they’re calling it now that they’re charging $120 a year for using it.