1 files changed, 12 insertions, 0 deletions
diff --git a/components/script/dom/webidls/CSSStyleSheet.webidl b/components/script/dom/webidls/CSSStyleSheet.webidl
new file mode 100644
index 00000000000..e30663fc778
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+++ b/components/script/dom/webidls/CSSStyleSheet.webidl
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// https://drafts.csswg.org/cssom/#the-cssstylesheet-interface
+[Exposed=(Window,Worker)]
+interface CSSStyleSheet : StyleSheet {
+  // readonly attribute CSSRule? ownerRule;
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  // unsigned long insertRule(DOMString rule, unsigned long index);
+  // void deleteRule(unsigned long index);
+};