PostCSS Viewport unit Variant This module is a PostCSS plugin to polyfill of viewport unit variants. It handle svh | lvh | dvh | svw | lvw | dvw see on caniuse Install npm --save install postcss postcss-view-sizes Usage /* input */ .full-screen { height: 100dvh; } become /* output */ .full-screen { height: 100vh; height: 100dvh; }