diff --git a/content/shared/public/nsLayoutAtomList.h b/content/shared/public/nsLayoutAtomList.h
index a62ff2c0122..6049f79de35 100644
--- a/content/shared/public/nsLayoutAtomList.h
+++ b/content/shared/public/nsLayoutAtomList.h
@@ -61,11 +61,16 @@ LAYOUT_ATOM(floaterList, "Floater-list")
 LAYOUT_ATOM(popupList, "Popup-list")
 
   // Alphabetical list of pseudo tag names for non-element content
+LAYOUT_ATOM(canvasPseudo, ":canvas")
 LAYOUT_ATOM(commentTagName, "__moz_comment")
+LAYOUT_ATOM(dummyOptionPseudo, ":-moz-dummy-option")
 LAYOUT_ATOM(textTagName, "__moz_text")
-LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
-LAYOUT_ATOM(viewportPseudo, ":-moz-viewport")
 LAYOUT_ATOM(pagePseudo, ":-moz-page")
+LAYOUT_ATOM(pageSequencePseudo, ":-moz-page-sequence")
+LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
+LAYOUT_ATOM(scrolledContentPseudo, ":scrolled-content")
+LAYOUT_ATOM(viewportPseudo, ":viewport")
+LAYOUT_ATOM(viewportScrollPseudo, ":viewport-scroll")
 
   // Alphabetical list of frame types
 LAYOUT_ATOM(areaFrame, "AreaFrame")
diff --git a/layout/base/nsLayoutAtomList.h b/layout/base/nsLayoutAtomList.h
index a62ff2c0122..6049f79de35 100644
--- a/layout/base/nsLayoutAtomList.h
+++ b/layout/base/nsLayoutAtomList.h
@@ -61,11 +61,16 @@ LAYOUT_ATOM(floaterList, "Floater-list")
 LAYOUT_ATOM(popupList, "Popup-list")
 
   // Alphabetical list of pseudo tag names for non-element content
+LAYOUT_ATOM(canvasPseudo, ":canvas")
 LAYOUT_ATOM(commentTagName, "__moz_comment")
+LAYOUT_ATOM(dummyOptionPseudo, ":-moz-dummy-option")
 LAYOUT_ATOM(textTagName, "__moz_text")
-LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
-LAYOUT_ATOM(viewportPseudo, ":-moz-viewport")
 LAYOUT_ATOM(pagePseudo, ":-moz-page")
+LAYOUT_ATOM(pageSequencePseudo, ":-moz-page-sequence")
+LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
+LAYOUT_ATOM(scrolledContentPseudo, ":scrolled-content")
+LAYOUT_ATOM(viewportPseudo, ":viewport")
+LAYOUT_ATOM(viewportScrollPseudo, ":viewport-scroll")
 
   // Alphabetical list of frame types
 LAYOUT_ATOM(areaFrame, "AreaFrame")
diff --git a/layout/base/public/nsLayoutAtomList.h b/layout/base/public/nsLayoutAtomList.h
index a62ff2c0122..6049f79de35 100644
--- a/layout/base/public/nsLayoutAtomList.h
+++ b/layout/base/public/nsLayoutAtomList.h
@@ -61,11 +61,16 @@ LAYOUT_ATOM(floaterList, "Floater-list")
 LAYOUT_ATOM(popupList, "Popup-list")
 
   // Alphabetical list of pseudo tag names for non-element content
+LAYOUT_ATOM(canvasPseudo, ":canvas")
 LAYOUT_ATOM(commentTagName, "__moz_comment")
+LAYOUT_ATOM(dummyOptionPseudo, ":-moz-dummy-option")
 LAYOUT_ATOM(textTagName, "__moz_text")
-LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
-LAYOUT_ATOM(viewportPseudo, ":-moz-viewport")
 LAYOUT_ATOM(pagePseudo, ":-moz-page")
+LAYOUT_ATOM(pageSequencePseudo, ":-moz-page-sequence")
+LAYOUT_ATOM(processingInstructionTagName, "__moz_pi")
+LAYOUT_ATOM(scrolledContentPseudo, ":scrolled-content")
+LAYOUT_ATOM(viewportPseudo, ":viewport")
+LAYOUT_ATOM(viewportScrollPseudo, ":viewport-scroll")
 
   // Alphabetical list of frame types
 LAYOUT_ATOM(areaFrame, "AreaFrame")