+ rebeccapurple

http://meyerweb.com/eric/thoughts/2014/06/19/rebeccapurple/
http://www.color-hex.com/color/663399
untested, but should be OK

Author: tomByrer

csscolorparser.cpp

@@ -159,6 +159,7 @@ constexpr NamedColor namedColors[] = {
     { "plum", { 221, 160, 221, 1 } },
     { "powderblue", { 176, 224, 230, 1 } },
     { "purple", { 128, 0, 128, 1 } },
+    { "rebeccapurple", { 102, 51, 153, 1 } },
     { "red", { 255, 0, 0, 1 } },
     { "rosybrown", { 188, 143, 143, 1 } },
     { "royalblue", { 65, 105, 225, 1 } },