diff --git a/components/atoms/static_atoms.txt b/components/atoms/static_atoms.txt
index 0798179c151..7fbd043dc0f 100644
--- a/components/atoms/static_atoms.txt
+++ b/components/atoms/static_atoms.txt
@@ -36,6 +36,7 @@ invalid
 keydown
 keypress
 left
+ltr
 load
 loadeddata
 loadedmetadata
@@ -65,6 +66,7 @@ readystatechange
 reftest-wait
 reset
 right
+rtl
 sans-serif
 scan
 screen