CSS Custom Properties (Variables)

third_party/WebKit/LayoutTests/imported/gecko/variables/support/external-variable-font-face.css

+@font-face {
+  --a: MyTestFontName;
+  font-family: var(--a);
+  src: url(../../resources/Ahem.ttf);
+}
+@font-face {
+  font-family: MyTestFontName2;
+  src: url(../../resources/Ahem.ttf);
+}
+#a {
+  font-family: MyTestFontName;
+}
+#b {
+  font-family: MyTestFontName2;
+}