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-rw-r--r--components/script/dom/webidls/CSSRule.webidl4
1 files changed, 4 insertions, 0 deletions
diff --git a/components/script/dom/webidls/CSSRule.webidl b/components/script/dom/webidls/CSSRule.webidl
index cda06ab1254..d36111b0cc0 100644
--- a/components/script/dom/webidls/CSSRule.webidl
+++ b/components/script/dom/webidls/CSSRule.webidl
@@ -31,3 +31,7 @@ partial interface CSSRule {
const unsigned short VIEWPORT_RULE = 15;
};
+// https://drafts.csswg.org/css-conditional-3/#extentions-to-cssrule-interface
+partial interface CSSRule {
+ const unsigned short SUPPORTS_RULE = 12;
+};