Graceful degradation @supports

    @supports(clip-path: polygon(0 0)) or (-webkit-clip-path: polygon(0 0)) {
        -webkit-clip-path: polygon(0 0, 100% 0, 100% 75vh, 0 100%);
        clip-path        : polygon(0 0, 100% 0, 100% 75vh, 0 100%);
        height           : 95vh;
    }