Install Source Features CCSS : property constraints VFL : 1-D element alignment @if @else Blocks Per-Element Responsiveness Custom Constraint Variables Accelerated 3D transforms * New Pseudo Selectors Nested Rules Respects Text Re-Flows Constraint Strengths Multi-threaded Web Workers * True Source Order Independence Works with Normal CSS * Maintains compatibility with browsers that don't support this feature Relative Positioning & Sizing Notice how you naturally would describe the nearby layout of iOS devices: "Horizontally center the devices, & the bottom of the iPhone & iPad should be equal." GSS stays true to our intentions: #iphone [ center-x ] == #ipad [ center-x ]; #iphone [ bottom ] == #ipad [ bottom ]; Polyfills from a Better Future Web developers are expected to build increasingly sophisticated UIs faster, ch...