diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 29b10fb8457..53b8dc0f480 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -1650,16 +1650,10 @@ fn render_impl(
             );
         }
     }
-    if toggled {
-        w.write_str("<div class=\"impl-items\">");
-        w.push_buffer(default_impl_items);
-        if trait_.is_some() && !impl_items.is_empty() {
-            w.write_str("<details class=\"undocumented\"><summary></summary>");
-            close_tags.insert_str(0, "</details>");
-        }
-        w.push_buffer(impl_items);
-        close_tags.insert_str(0, "</div>");
-    }
+    w.write_str("<div class=\"impl-items\">");
+    w.push_buffer(default_impl_items);
+    w.push_buffer(impl_items);
+    close_tags.insert_str(0, "</div>");
     w.write_str(&close_tags);
 }
 
diff --git a/src/test/rustdoc/assoc-consts.rs b/src/test/rustdoc/assoc-consts.rs
index 7bfa922185b..a3dd166e651 100644
--- a/src/test/rustdoc/assoc-consts.rs
+++ b/src/test/rustdoc/assoc-consts.rs
@@ -88,14 +88,12 @@ impl Qux for Bar {
     /// Docs for QUX1 in impl.
     const QUX1: i8 = 5;
     // @has - '//*[@id="associatedconstant.QUX_DEFAULT0"]' 'const QUX_DEFAULT0: u16'
-    // @!has - '//div[@class="impl-items"]/details[@open=""]//*[@class="docblock"]' "Docs for QUX_DEFAULT12 in trait."
-    // @has - '//div[@class="impl-items"]/details//*[@class="docblock"]' "Docs for QUX_DEFAULT12 in trait."
+    // @has - '//div[@class="impl-items"]//*[@class="docblock"]' "Docs for QUX_DEFAULT12 in trait."
     const QUX_DEFAULT0: u16 = 6;
     // @has - '//*[@id="associatedconstant.QUX_DEFAULT1"]' 'const QUX_DEFAULT1: i16'
     // @has - '//*[@class="docblock"]' "Docs for QUX_DEFAULT1 in impl."
     /// Docs for QUX_DEFAULT1 in impl.
     const QUX_DEFAULT1: i16 = 7;
     // @has - '//*[@id="associatedconstant.QUX_DEFAULT2"]' 'const QUX_DEFAULT2: u32'
-    // @!has - '//div[@class="impl-items"]/details[@open=""]//*[@class="docblock"]' "Docs for QUX_DEFAULT2 in trait."
-    // @has - '//div[@class="impl-items"]/details//*[@class="docblock"]' "Docs for QUX_DEFAULT2 in trait."
+    // @has - '//div[@class="impl-items"]//*[@class="docblock"]' "Docs for QUX_DEFAULT2 in trait."
 }
diff --git a/src/test/rustdoc/inline_cross/assoc-items.rs b/src/test/rustdoc/inline_cross/assoc-items.rs
index 8fc01c3f04c..231805a52b9 100644
--- a/src/test/rustdoc/inline_cross/assoc-items.rs
+++ b/src/test/rustdoc/inline_cross/assoc-items.rs
@@ -16,18 +16,15 @@ extern crate assoc_items;
 // @has - '//*[@id="associatedconstant.ConstNoDefault"]' 'const ConstNoDefault: i16'
 // @has - '//*[@class="docblock"]' 'dox for ConstNoDefault'
 // @has - '//*[@id="associatedconstant.ConstWithDefault"]' 'const ConstWithDefault: u16'
-// @!has - '//details[@open=""]/details/div[@class="docblock"]' 'docs for ConstWithDefault'
-// @has - '//details/details/div[@class="docblock"]' 'docs for ConstWithDefault'
+// @has - '//div[@class="docblock"]' 'docs for ConstWithDefault'
 // @has - '//*[@id="associatedtype.TypeNoDefault"]' 'type TypeNoDefault = i32'
 // @has - '//*[@class="docblock"]' 'dox for TypeNoDefault'
 // @has - '//*[@id="associatedtype.TypeWithDefault"]' 'type TypeWithDefault = u32'
-// @!has - '//details[@open=""]/details/div[@class="docblock"]' 'docs for TypeWithDefault'
-// @has - '//details/details/div[@class="docblock"]' 'docs for TypeWithDefault'
+// @has - '//div[@class="docblock"]' 'docs for TypeWithDefault'
 // @has - '//*[@id="method.method_no_default"]' 'fn method_no_default()'
 // @has - '//*[@class="docblock"]' 'dox for method_no_default'
 // @has - '//*[@id="method.method_with_default"]' 'fn method_with_default()'
-// @!has - '//details[@open=""]/details/div[@class="docblock"]' 'docs for method_with_default'
-// @has - '//details/details/div[@class="docblock"]' 'docs for method_with_default'
+// @has - '//div[@class="docblock"]' 'docs for method_with_default'
 pub use assoc_items::MyStruct;
 
 // @has foo/trait.MyTrait.html
diff --git a/src/test/rustdoc/inline_cross/impl-inline-without-trait.rs b/src/test/rustdoc/inline_cross/impl-inline-without-trait.rs
index cc0596c70ce..9b67022fd4b 100644
--- a/src/test/rustdoc/inline_cross/impl-inline-without-trait.rs
+++ b/src/test/rustdoc/inline_cross/impl-inline-without-trait.rs
@@ -8,6 +8,5 @@ extern crate impl_inline_without_trait;
 
 // @has 'foo/struct.MyStruct.html'
 // @has - '//*[@id="method.my_trait_method"]' 'fn my_trait_method()'
-// @!has - '//details[@open=""]/details/div[@class="docblock"]' 'docs for my_trait_method'
-// @has - '//details/details/div[@class="docblock"]' 'docs for my_trait_method'
+// @has - '//div[@class="docblock"]' 'docs for my_trait_method'
 pub use impl_inline_without_trait::MyStruct;
diff --git a/src/test/rustdoc/manual_impl.rs b/src/test/rustdoc/manual_impl.rs
index 5b448bd1923..b2ee077bc6b 100644
--- a/src/test/rustdoc/manual_impl.rs
+++ b/src/test/rustdoc/manual_impl.rs
@@ -24,13 +24,10 @@ pub trait T {
 // @has  - '//*[@class="docblock"]' 'Docs associated with the S1 trait implementation.'
 // @has  - '//*[@class="docblock"]' 'Docs associated with the S1 trait a_method implementation.'
 // @!has - '//*[@class="docblock"]' 'Docs associated with the trait a_method definition.'
-// @!has - '//div[@class="impl-items"]/details[@open=""]//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
-// @has - '//div[@class="impl-items"]/details//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
-// @!has - '//div[@class="impl-items"]/details[@open=""]//div[@class="docblock"]' 'Docs associated with the trait c_method definition.'
-// @has - '//div[@class="impl-items"]/details//div[@class="docblock"]' 'Docs associated with the trait c_method definition.'
+// @has - '//div[@class="impl-items"]//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
+// @has - '//div[@class="impl-items"]//div[@class="docblock"]' 'Docs associated with the trait c_method definition.'
 // @!has - '//*[@class="docblock"]' 'There is another line'
-// @!has - '//div[@class="impl-items"]/details[@open=""]//div[@class="docblock"]' 'Read more'
-// @has - '//div[@class="impl-items"]/details//div[@class="docblock"]' 'Read more'
+// @has - '//div[@class="impl-items"]//div[@class="docblock"]' 'Read more'
 pub struct S1(usize);
 
 /// Docs associated with the S1 trait implementation.
@@ -45,10 +42,7 @@ impl T for S1 {
 // @has  - '//*[@class="docblock"]' 'Docs associated with the S2 trait implementation.'
 // @has  - '//*[@class="docblock"]' 'Docs associated with the S2 trait a_method implementation.'
 // @has  - '//*[@class="docblock"]' 'Docs associated with the S2 trait c_method implementation.'
-// @!has - '//details[open=""]/div[@class="docblock"]' 'Docs associated with the trait a_method definition.'
-// @!has - '//details[open=""]/div[@class="docblock"]' 'Docs associated with the trait c_method definition.'
-// @!has - '//div[@class="impl-items"]/details[@open=""]//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
-// @has - '//div[@class="impl-items"]/details//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
+// @has - '//div[@class="impl-items"]//div[@class="docblock"]' 'Docs associated with the trait b_method definition.'
 pub struct S2(usize);
 
 /// Docs associated with the S2 trait implementation.
@@ -65,11 +59,9 @@ impl T for S2 {
 }
 
 // @has manual_impl/struct.S3.html '//*[@class="trait"]' 'T'
-// @has  - '//details/div[@class="docblock"]' 'Docs associated with the S3 trait implementation.'
-// @!has  - '//details[@open=""]/div[@class="docblock"]' 'Docs associated with the S3 trait implementation.'
-// @has  - '//details[@open=""]/div[@class="docblock"]' 'Docs associated with the S3 trait b_method implementation.'
-// @!has - '//div[@class="impl-items"]/details[@open=""]//div[@class="docblock"]' 'Docs associated with the trait a_method definition.'
-// @has - '//div[@class="impl-items"]/details//div[@class="docblock"]' 'Docs associated with the trait a_method definition.'
+// @has  - '//div[@class="docblock"]' 'Docs associated with the S3 trait implementation.'
+// @has  - '//div[@class="docblock"]' 'Docs associated with the S3 trait b_method implementation.'
+// @has - '//div[@class="impl-items"]//div[@class="docblock"]' 'Docs associated with the trait a_method definition.'
 pub struct S3(usize);
 
 /// Docs associated with the S3 trait implementation.
diff --git a/src/test/rustdoc/item-hide-threshold.rs b/src/test/rustdoc/toggle-item-contents.rs
similarity index 85%
rename from src/test/rustdoc/item-hide-threshold.rs
rename to src/test/rustdoc/toggle-item-contents.rs
index 8986f72636a..6e3c0b4c681 100644
--- a/src/test/rustdoc/item-hide-threshold.rs
+++ b/src/test/rustdoc/toggle-item-contents.rs
@@ -1,13 +1,13 @@
 #![allow(unused)]
 
-// @has 'item_hide_threshold/struct.PubStruct.html'
+// @has 'toggle_item_contents/struct.PubStruct.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 0
 pub struct PubStruct {
     pub a: usize,
     pub b: usize,
 }
 
-// @has 'item_hide_threshold/struct.BigPubStruct.html'
+// @has 'toggle_item_contents/struct.BigPubStruct.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show fields'
 pub struct BigPubStruct {
@@ -26,7 +26,7 @@ pub struct BigPubStruct {
     pub m: usize,
 }
 
-// @has 'item_hide_threshold/union.BigUnion.html'
+// @has 'toggle_item_contents/union.BigUnion.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show fields'
 pub union BigUnion {
@@ -45,7 +45,7 @@ pub union BigUnion {
     pub m: usize,
 }
 
-// @has 'item_hide_threshold/union.Union.html'
+// @has 'toggle_item_contents/union.Union.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 0
 pub union Union {
     pub a: usize,
@@ -53,7 +53,7 @@ pub union Union {
     pub c: usize,
 }
 
-// @has 'item_hide_threshold/struct.PrivStruct.html'
+// @has 'toggle_item_contents/struct.PrivStruct.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 0
 // @has - '//div[@class="docblock type-decl"]' 'fields omitted'
 pub struct PrivStruct {
@@ -61,7 +61,7 @@ pub struct PrivStruct {
     b: usize,
 }
 
-// @has 'item_hide_threshold/enum.Enum.html'
+// @has 'toggle_item_contents/enum.Enum.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show fields'
 pub enum Enum {
@@ -72,14 +72,14 @@ pub enum Enum {
     }
 }
 
-// @has 'item_hide_threshold/enum.LargeEnum.html'
+// @has 'toggle_item_contents/enum.LargeEnum.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show variants'
 pub enum LargeEnum {
     A, B, C, D, E, F(u8), G, H, I, J, K, L, M
 }
 
-// @has 'item_hide_threshold/trait.Trait.html'
+// @has 'toggle_item_contents/trait.Trait.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 0
 pub trait Trait {
     type A;
@@ -88,7 +88,7 @@ pub trait Trait {
     fn bar();
 }
 
-// @has 'item_hide_threshold/trait.GinormousTrait.html'
+// @has 'toggle_item_contents/trait.GinormousTrait.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show associated items'
 pub trait GinormousTrait {
@@ -111,7 +111,7 @@ pub trait GinormousTrait {
     fn bar();
 }
 
-// @has 'item_hide_threshold/trait.HugeTrait.html'
+// @has 'toggle_item_contents/trait.HugeTrait.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show associated constants and methods'
 pub trait HugeTrait {
@@ -133,7 +133,7 @@ pub trait HugeTrait {
     fn bar();
 }
 
-// @has 'item_hide_threshold/trait.BigTrait.html'
+// @has 'toggle_item_contents/trait.BigTrait.html'
 // @count - '//details[@class="rustdoc-toggle type-contents-toggle"]' 1
 // @has - '//details[@class="rustdoc-toggle type-contents-toggle"]' 'Show methods'
 pub trait BigTrait {
diff --git a/src/test/rustdoc/toggle-method.rs b/src/test/rustdoc/toggle-method.rs
new file mode 100644
index 00000000000..f7f6086a4cb
--- /dev/null
+++ b/src/test/rustdoc/toggle-method.rs
@@ -0,0 +1,18 @@
+#![crate_name = "foo"]
+
+// Struct methods with documentation should be wrapped in a <details> toggle with an appropriate
+// summary. Struct methods with no documentation should not be wrapped.
+//
+// @has foo/struct.Foo.html
+// @has - '//details[@class="rustdoc-toggle method-toggle"]//summary//code' 'is_documented()'
+// @has - '//details[@class="rustdoc-toggle method-toggle"]//*[@class="docblock"]' 'is_documented is documented'
+// @!has - '//details[@class="rustdoc-toggle method-toggle"]//summary//code' 'not_documented()'
+pub struct Foo {
+}
+
+impl Foo {
+    pub fn not_documented() {}
+
+    /// is_documented is documented
+    pub fn is_documented() {}
+}
diff --git a/src/test/rustdoc/toggle-trait-fn.rs b/src/test/rustdoc/toggle-trait-fn.rs
index 7fcac78556b..0bc5eba75a1 100644
--- a/src/test/rustdoc/toggle-trait-fn.rs
+++ b/src/test/rustdoc/toggle-trait-fn.rs
@@ -1,11 +1,23 @@
 #![crate_name = "foo"]
 
+// Trait methods with documentation should be wrapped in a <details> toggle with an appropriate
+// summary. Trait methods with no documentation should not be wrapped.
+//
 // @has foo/trait.Foo.html
-// @!has - '//details[@class="rustdoc-toggle"]//code' 'bar'
-// @has - '//code' 'bar'
-// @has - '//details[@class="rustdoc-toggle"]//code' 'foo'
+// @has -  '//details[@class="rustdoc-toggle"]//summary//code' 'is_documented()'
+// @!has - '//details[@class="rustdoc-toggle"]//summary//code' 'not_documented()'
+// @has -  '//details[@class="rustdoc-toggle"]//*[@class="docblock"]' 'is_documented is documented'
+// @has -  '//details[@class="rustdoc-toggle"]//summary//code' 'is_documented_optional()'
+// @!has - '//details[@class="rustdoc-toggle"]//summary//code' 'not_documented_optional()'
+// @has -  '//details[@class="rustdoc-toggle"]//*[@class="docblock"]' 'is_documented_optional is documented'
 pub trait Foo {
-    fn bar() -> ();
-    /// hello
-    fn foo();
+    fn not_documented();
+
+    /// is_documented is documented
+    fn is_documented();
+
+    fn not_documented_optional() {}
+
+    /// is_documented_optional is documented
+    fn is_documented_optional() {}
 }