1 files changed, 33 insertions, 0 deletions
diff --git a/components/script/dom/webidls/CSSRule.webidl b/components/script/dom/webidls/CSSRule.webidl
new file mode 100644
index 00000000000..1c1015c9fe4
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+++ b/components/script/dom/webidls/CSSRule.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-cssrule-interface
+[Exposed=(Window,Worker)]
+interface CSSRule {
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2; // historical
+  const unsigned short IMPORT_RULE = 3;
+  const unsigned short MEDIA_RULE = 4;
+  const unsigned short FONT_FACE_RULE = 5;
+  const unsigned short PAGE_RULE = 6;
+  const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+
+  readonly attribute unsigned short type;
+  attribute DOMString cssText;
+  // readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+};
+
+// https://drafts.csswg.org/css-animations/#interface-cssrule-idl
+partial interface CSSRule {
+    const unsigned short KEYFRAMES_RULE = 7;
+    const unsigned short KEYFRAME_RULE = 8;
+};
+
+// https://drafts.csswg.org/css-device-adapt/#css-rule-interface
+partial interface CSSRule {
+    const unsigned short VIEWPORT_RULE = 15;
+};
+