@roxigo – That is very interesting framework I see that it’s new ( first commit is less than a day old) , but we can assume it’s ready for production? ThemeFuse uses it?
Safari for windows has been discontinued. And market share is non existent. calc() works in IE9 except when you try to position background images with it. Official Twenty Fourteen theme is using calc().
I believe that they are using iframes so the page is never “really” reloaded.
They do it after the theme is put up for sale, so the reviewers never see that.
For start, because the design is not yours.
you can print it on your dog and it will work!