1 files changed, 9 insertions, 0 deletions
diff --git a/layout/style/nsRuleNode.cpp b/layout/style/nsRuleNode.cpp
index 504b66ac21..04715aa99a 100644
--- a/layout/style/nsRuleNode.cpp
+++ b/layout/style/nsRuleNode.cpp
@@ -1394,6 +1394,7 @@ struct SetEnumValueHelper
   DEFINE_ENUM_CLASS_SETTER(StyleFillRule, Nonzero, Evenodd)
   DEFINE_ENUM_CLASS_SETTER(StyleFloat, None, InlineEnd)
   DEFINE_ENUM_CLASS_SETTER(StyleFloatEdge, ContentBox, MarginBox)
+  DEFINE_ENUM_CLASS_SETTER(StyleScrollbarWidth, Auto, None)
   DEFINE_ENUM_CLASS_SETTER(StyleTextJustify, None, InterCharacter)
   DEFINE_ENUM_CLASS_SETTER(StyleUserFocus, None, SelectMenu)
   DEFINE_ENUM_CLASS_SETTER(StyleUserSelect, None, MozText)
@@ -5235,6 +5236,14 @@ nsRuleNode::ComputeUserInterfaceData(void* aStartStruct,
   // caret-color: auto, color, inherit
   setComplexColor(aRuleData->ValueForCaretColor(),
                   &nsStyleUserInterface::mCaretColor);
+  
+  // scrollbar-width: auto, thin, none
+  SetValue(*aRuleData->ValueForScrollbarWidth(),
+           ui->mScrollbarWidth,
+           conditions,
+           SETVAL_ENUMERATED,
+           parentUI->mScrollbarWidth,
+           StyleScrollbarWidth::Auto);
 
   COMPUTE_END_INHERITED(UserInterface, ui)
 }