diff --git a/components/style/properties/computed_value_flags.rs b/components/style/properties/computed_value_flags.rs
index bddb451861e..4ddc9a1f42a 100644
--- a/components/style/properties/computed_value_flags.rs
+++ b/components/style/properties/computed_value_flags.rs
@@ -41,10 +41,6 @@ bitflags! {
         /// A flag used to mark styles which are a pseudo-element or under one.
         const IS_IN_PSEUDO_ELEMENT_SUBTREE = 1 << 4;
 
-        /// A flag used to mark styles which are in a display: none subtree, or
-        /// under one.
-        const IS_IN_DISPLAY_NONE_SUBTREE = 1 << 5;
-
         /// Whether this style inherits the `display` property.
         ///
         /// This is important because it may affect our optimizations to avoid
@@ -77,7 +73,6 @@ impl ComputedValueFlags {
         ComputedValueFlags::IS_STYLE_IF_VISITED |
         ComputedValueFlags::IS_RELEVANT_LINK_VISITED |
         ComputedValueFlags::CAN_BE_FRAGMENTED |
-        ComputedValueFlags::IS_IN_DISPLAY_NONE_SUBTREE |
         ComputedValueFlags::IS_IN_PSEUDO_ELEMENT_SUBTREE |
         ComputedValueFlags::HAS_TEXT_DECORATION_LINES
     }
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index ba38d9532d0..81e9a09cbe8 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -2537,13 +2537,6 @@ impl ComputedValues {
         self.visited_style.as_ref().and_then(|s| s.rules.as_ref())
     }
 
-    /// Returns whether we're in a display: none subtree.
-    pub fn is_in_display_none_subtree(&self) -> bool {
-        use properties::computed_value_flags::ComputedValueFlags;
-
-        self.flags.contains(ComputedValueFlags::IS_IN_DISPLAY_NONE_SUBTREE)
-    }
-
     /// Gets a reference to the custom properties map (if one exists).
     pub fn custom_properties(&self) -> Option<<&Arc<::custom_properties::CustomPropertiesMap>> {
         self.custom_properties.as_ref()
diff --git a/components/style/style_adjuster.rs b/components/style/style_adjuster.rs
index 4fcbffc5345..2bb400f63ec 100644
--- a/components/style/style_adjuster.rs
+++ b/components/style/style_adjuster.rs
@@ -204,12 +204,6 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
                 .insert(ComputedValueFlags::HAS_TEXT_DECORATION_LINES);
         }
 
-        if display == Display::None {
-            self.style
-                .flags
-                .insert(ComputedValueFlags::IS_IN_DISPLAY_NONE_SUBTREE);
-        }
-
         if self.style.is_pseudo_element() {
             self.style
                 .flags