diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index 318e1b44f86..b3bd1cd0121 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -1545,7 +1545,7 @@ fn render_impl(
     let open_details = |close_tags: &mut String| {
         if toggled {
             close_tags.insert_str(0, "</details>");
-            "<details class=\"rustdoc-toggle implementors-toggle\" open><summary>"
+            "<details class=\"rustdoc-toggle implementors-toggle\"><summary>"
         } else {
             ""
         }
diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 1e28056bb68..a96b0c87108 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -776,12 +776,29 @@ function hideThemeButtonState() {
 
         var hideMethodDocs = getSettingValue("auto-hide-method-docs") === "true";
         var hideImplementors = getSettingValue("auto-collapse-implementors") !== "false";
+        var hideImplementations = getSettingValue("auto-hide-trait-implementations") !== "false";
         var hideLargeItemContents = getSettingValue("auto-hide-large-items") !== "false";
 
-        onEachLazy(document.getElementsByTagName("details"), function (e) {
-            var showLargeItem = !hideLargeItemContents && hasClass(e, "type-contents-toggle");
-            var showImplementor = !hideImplementors && hasClass(e, "implementors-toggle");
-            if (showLargeItem || showImplementor) {
+        function openImplementors(id) {
+            var list = document.getElementById(id);
+            if (list !== null) {
+                onEachLazy(list.getElementsByClassName("implementors-toggle"), function(e) {
+                    e.open = true;
+                });
+            }
+        }
+
+        if (!hideImplementations) {
+            openImplementors("trait-implementations-list");
+            openImplementors("blanket-implementations-list");
+        }
+
+        if (!hideImplementors) {
+            openImplementors("implementors-list");
+        }
+
+        onEachLazy(document.getElementsByClassName("rustdoc-toggle"), function (e) {
+            if (!hideLargeItemContents && hasClass(e, "type-contents-toggle")) {
                 e.open = true;
             }
             if (hideMethodDocs && hasClass(e, "method-toggle")) {
diff --git a/src/test/rustdoc/manual_impl.rs b/src/test/rustdoc/manual_impl.rs
index 776a191ceef..5b448bd1923 100644
--- a/src/test/rustdoc/manual_impl.rs
+++ b/src/test/rustdoc/manual_impl.rs
@@ -65,7 +65,8 @@ impl T for S2 {
 }
 
 // @has manual_impl/struct.S3.html '//*[@class="trait"]' 'T'
-// @has  - '//details[@open=""]/div[@class="docblock"]' 'Docs associated with the S3 trait implementation.'
+// @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.'