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-rw-r--r--layout/style/res/ua.css6
1 files changed, 6 insertions, 0 deletions
diff --git a/layout/style/res/ua.css b/layout/style/res/ua.css
index 931b32eb8..504f5dc57 100644
--- a/layout/style/res/ua.css
+++ b/layout/style/res/ua.css
@@ -471,3 +471,9 @@ div:-moz-native-anonymous.moz-custom-content-container {
width: 100%;
height: 100%;
}
+
+/* Shadow DOM v1
+ * https://drafts.csswg.org/css-scoping/#slots-in-shadow-tree */
+slot {
+ display: contents;
+} \ No newline at end of file