Add css-inline-3.vim and test

See also: http://www.w3.org/TR/css-inline-3/

test/test.css

@@ -232,6 +232,11 @@
   display: repeating-radial-gradient(farthest-corner at 50% 50%, yellow, green);
 }
 
+.inline {
+  initial-letter: ideographic;
+  initial-letter-align: auto;
+}
+
 .layout::slot(b) {
   display: same;
 }

test/test.html

@@ -243,6 +243,11 @@
         display: repeating-radial-gradient(farthest-corner at 50% 50%, yellow, green);
       }
 
+      .inline {
+        initial-letter: ideographic;
+        initial-letter-align: auto;
+      }
+
       .layout::slot(b) {
         display: same;
       }