diff --git a/mozilla/layout/html/document/src/ua.css b/mozilla/layout/html/document/src/ua.css
index b1fc2dd9040..d9c36ac7408 100644
--- a/mozilla/layout/html/document/src/ua.css
+++ b/mozilla/layout/html/document/src/ua.css
@@ -517,3 +517,19 @@ NOFRAMES {
   margin-bottom: inherit;
   background: inherit;
 }
+
+:TABLE-COLUMN {
+	display: table-column;
+}
+
+:TABLE-COLUMN-GROUP {
+	display: table-column-group;
+}
+
+:TABLE-ROW {
+	display: table-row;
+}
+
+:TABLE-ROW-GROUP {
+	display: table-row-group;
+}
\ No newline at end of file
diff --git a/mozilla/layout/style/ua.css b/mozilla/layout/style/ua.css
index b1fc2dd9040..d9c36ac7408 100644
--- a/mozilla/layout/style/ua.css
+++ b/mozilla/layout/style/ua.css
@@ -517,3 +517,19 @@ NOFRAMES {
   margin-bottom: inherit;
   background: inherit;
 }
+
+:TABLE-COLUMN {
+	display: table-column;
+}
+
+:TABLE-COLUMN-GROUP {
+	display: table-column-group;
+}
+
+:TABLE-ROW {
+	display: table-row;
+}
+
+:TABLE-ROW-GROUP {
+	display: table-row-group;
+}
\ No newline at end of file