1 files changed, 8 insertions, 0 deletions
diff --git a/components/script_bindings/webidls/CSSStyleSheet.webidl b/components/script_bindings/webidls/CSSStyleSheet.webidl
index 701a5637eb2..1241b5c2769 100644
--- a/components/script_bindings/webidls/CSSStyleSheet.webidl
+++ b/components/script_bindings/webidls/CSSStyleSheet.webidl
@@ -5,12 +5,20 @@
 // https://drafts.csswg.org/cssom/#the-cssstylesheet-interface
 [Exposed=Window]
 interface CSSStyleSheet : StyleSheet {
+  constructor(optional CSSStyleSheetInit options = {});
+
   // readonly attribute CSSRule? ownerRule;
   [Throws, SameObject] readonly attribute CSSRuleList cssRules;
   [Throws] unsigned long insertRule(DOMString rule, optional unsigned long index = 0);
   [Throws] undefined deleteRule(unsigned long index);
 };
 
+dictionary CSSStyleSheetInit {
+  // DOMString baseURL = null;
+  (MediaList or DOMString) media;
+  boolean disabled = false;
+};
+
 // https://drafts.csswg.org/cssom/#legacy-css-style-sheet-members
 partial interface CSSStyleSheet {
   [Throws, SameObject] readonly attribute CSSRuleList rules;