Conic gradients are awesome, but browsers haven’t realized yet. This polyfill lets you experiment with them now
This polyfill takes the official CSS filters syntax and translates it to the different equivalent techniques that the browsers know for those effects.
CSS Shapes Polyfill
Grid Style Sheets
GSS reimagines CSS layout & replaces the browser’s layout engine with one that harnesses the Cassowary Constraint Solver — the same algorithm Apple uses to compute native layout.
Placeholder Polyfill with Password Support
The problem with placeholders is that the feature is not supported in IE 9 and below. This is a huge pain if you use placeholders as labels…
A responsive image polyfill for picture, srcset, sizes, and more.
Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.
A polyfill for CSS units vw, vh & vmin and now some media queries to boot.
REM unit polyfill
The polyfill will test any browser for REM support and patch it up if needed, although we all know IE8 and below is where the issue lies. Once lack of support is determined, it reads all the link tags for stylesheets and finds selectors that have rules using the REM unit. It then recalculates those rules to PX and writes them in the head to override in the cascade. Magic.
FastClick is a simple, easy-to-use library for eliminating the 300ms delay between a physical tap and the firing of a click event on mobile browsers. The aim is to make your application feel less laggy and more responsive while avoiding any interference with your current logic.
Pointer Events Polyfill: a unified event system for the web platform.
SVG for Everybody
Use external SVG spritemaps today. SVG for Everybody minds the gap between SVG-capable browsers and those which do not support external SVG spritemaps.
Document register element
document-register-element.js is a stand alone polyfill which aim is to support as many browsers as possible, without requiring extra dependencies at all, and in about 3KB minified and gzipped.