1 files changed, 11 insertions, 0 deletions
diff --git a/components/script/dom/webidls/CSSRuleList.webidl b/components/script/dom/webidls/CSSRuleList.webidl
new file mode 100644
index 00000000000..8ee12004a26
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+++ b/components/script/dom/webidls/CSSRuleList.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/#cssrulelist
+// [LegacyArrayClass]
+[Exposed=Window]
+interface CSSRuleList {
+  getter CSSRule? item(unsigned long index);
+  readonly attribute unsigned long length;
+};