+/* foreground representation */
+#digraphs .u-l3 {color: #080} /* partial */
+#digraphs .u-l3.ex {color: #4C0} /* experimental */
+#digraphs .u-l2 {color: #A44; color: rgba(128, 0, 0, .6)} /* unofficial proposal */
+#digraphs .u-l1 {color: #D00; color: rgba(255, 0, 0, .8)} /* minimal or invalid */
+
+/* support percentage (browser cells) */
+.p0 {opacity: .6}
+.p0.p {opacity: 1}
+.p::after {content: '!'; color: #F00}
+.p4::after {color: #C00}
+.p3::after {color: #A00}
+.p2::after {color: #800}
+.p1::after,
+.p0::after {color: #000}
+.p09::after {opacity: .9}
+.p08::after {opacity: .8}
+.p07::after {opacity: .7}
+.p06::after {opacity: .6}
+.p05::after {opacity: .5}
+.p04::after {opacity: .4}
+.p03::after {opacity: .3}
+.p02::after {opacity: .2}
+.p01::after {opacity: .1}
+.p00::after {display: none}
+