Add interfaces/css-shadow-parts.idl

Source: https://github.com/tidoust/reffy-reports/blob/44cfbb4/ed/idl/css-shadow-parts.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/589347016

Author: autofoolip

interfaces/css-shadow-parts.idl

@@ -0,0 +1,8 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: CSS Shadow Parts (http://drafts.csswg.org/css-shadow-parts/)
+
+partial interface Element {
+  [SameObject, PutForwards=value] readonly attribute DOMTokenList part;
+};