Author: Erick Velez
Date: 2026-01-06T13:42:29-08:00
New Revision: 8ed9a400c175727b53c79b438362a0cb7f189057

URL: 
https://github.com/llvm/llvm-project/commit/8ed9a400c175727b53c79b438362a0cb7f189057
DIFF: 
https://github.com/llvm/llvm-project/commit/8ed9a400c175727b53c79b438362a0cb7f189057.diff

LOG: [clang-doc] Make sidebar sections collapsible (#174531)

Collapsible lists are achieved via `<details>` and their child
`<summary>` tags. `<details>` tags allow for a section to be designated
as collapsible, while the `<summary>` tag is used as the sidebar
section's header. This approach was chosen over making the lists
stateful through various CSS properties.

This patch also refactors the `<li>` tag structure of sidebar sections.
Previously, the section header and list items were in separate `<li>`
tags without sharing a parent. Now, the header and items are under a
single `<li>` tag which makes more sense semantically.

Added: 
    

Modified: 
    clang-tools-extra/clang-doc/assets/clang-doc-mustache.css
    clang-tools-extra/clang-doc/assets/class-template.mustache
    clang-tools-extra/clang-doc/assets/index-template.mustache
    clang-tools-extra/clang-doc/assets/namespace-template.mustache
    clang-tools-extra/test/clang-doc/basic-project.mustache.test
    clang-tools-extra/test/clang-doc/index.cpp
    clang-tools-extra/test/clang-doc/json/class.cpp
    clang-tools-extra/test/clang-doc/json/compound-constraints.cpp
    clang-tools-extra/test/clang-doc/mustache-index.cpp
    clang-tools-extra/test/clang-doc/mustache-separate-namespace.cpp
    clang-tools-extra/test/clang-doc/typedef-alias.cpp

Removed: 
    


################################################################################
diff  --git a/clang-tools-extra/clang-doc/assets/clang-doc-mustache.css 
b/clang-tools-extra/clang-doc/assets/clang-doc-mustache.css
index 67f11f77eae61..0181e255f4d9f 100644
--- a/clang-tools-extra/clang-doc/assets/clang-doc-mustache.css
+++ b/clang-tools-extra/clang-doc/assets/clang-doc-mustache.css
@@ -421,8 +421,7 @@ body, html {
 }
 
 .sidebar ul li {
-    padding-right: 1rem;
-    padding-left: 2rem;
+    padding-left: 1rem;
     padding-top: 0.25rem;
     padding-bottom: 0.25rem;
 }
@@ -430,8 +429,7 @@ body, html {
 .sidebar-section {
     font-size:1.5rem;
     font-weight: bold;
-    margin-bottom: 1rem;
-    padding: 3rem;
+    padding-left: 1rem;
 }
 .sidebar-section a {
     color: var(--brand)

diff  --git a/clang-tools-extra/clang-doc/assets/class-template.mustache 
b/clang-tools-extra/clang-doc/assets/class-template.mustache
index 20510b6fd4d10..0b29ad23129c6 100644
--- a/clang-tools-extra/clang-doc/assets/class-template.mustache
+++ b/clang-tools-extra/clang-doc/assets/class-template.mustache
@@ -16,115 +16,131 @@
                 <h2>{{TagType}} {{Name}}</h2>
                 <ul>
                     {{#HasPublicMembers}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#PublicMembers">Public 
Members</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#PublicMembers}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
-                            </li>
-                            {{/PublicMembers}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                              <a class="sidebar-item" 
href="#PublicMembers">Public Members</a>
+                            </summary>
+                            <ul>
+                                {{#PublicMembers}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
+                                </li>
+                                {{/PublicMembers}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasPublicMembers}}
                     {{#ProtectedMembers}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" 
href="#PublicMethods">Protected Members</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Obj}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
-                            </li>
-                            {{/Obj}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#PublicMethods">Protected Members</a>
+                            </summary>
+                            <ul>
+                                {{#Obj}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
+                                </li>
+                                {{/Obj}}
+                            </ul>
+                        </details>
                     </li>
                     {{/ProtectedMembers}}
                     {{#HasPublicFunctions}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#PublicMethods">Public 
Method</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#PublicFunctions}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/PublicFunctions}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+                            </summary>
+                            <ul>
+                                {{#PublicFunctions}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/PublicFunctions}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasPublicFunctions}}
                     {{#ProtectedFunction}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" 
href="#ProtectedFunction">Protected Method</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Obj}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{ID}}">{{Name}}</a>
-                            </li>
-                            {{/Obj}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#ProtectedFunction">Protected Method</a>
+                            </summary>
+                            <ul>
+                                {{#Obj}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{ID}}">{{Name}}</a>
+                                </li>
+                                {{/Obj}}
+                            </ul>
+                        </details>
                     </li>
                     {{/ProtectedFunction}}
                     {{#HasEnums}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Enums">Enums</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Enums}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Enums}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" href="#Enums">Enums</a>
+                            </summary>
+                            <ul>
+                                {{#Enums}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Enums}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasEnums}}
                     {{#HasTypedefs}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Typedefs">Typedefs</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Typedefs}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Typedefs}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Typedefs">Typedefs</a>
+                            </summary>
+                            <ul>
+                                {{#Typedefs}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Typedefs}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasTypedefs}}
                     {{#HasRecords}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Classes">Inner 
Classes</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Records}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Records}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" href="#Classes">Inner 
Classes</a>
+                            </summary>
+                            <ul>
+                                {{#Records}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Records}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasRecords}}
                     {{#HasFriends}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Friends">Friends</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Friends}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{Reference.USR}}">{{Reference.Name}}</a>
-                            </li>
-                            {{/Friends}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Friends">Friends</a>
+                            </summary>
+                            <ul>
+                                {{#Friends}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{Reference.USR}}">{{Reference.Name}}</a>
+                                </li>
+                                {{/Friends}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasRecords}}
                 </ul>

diff  --git a/clang-tools-extra/clang-doc/assets/index-template.mustache 
b/clang-tools-extra/clang-doc/assets/index-template.mustache
index de64da4d709ee..cee7df872a0e8 100644
--- a/clang-tools-extra/clang-doc/assets/index-template.mustache
+++ b/clang-tools-extra/clang-doc/assets/index-template.mustache
@@ -8,17 +8,19 @@
             <div class="sidebar">
                 <h2>{{ProjectName}}</h2>
                 <ul>
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Index}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
-                            </li>
-                            {{/Index}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
+                            </summary>
+                            <ul>
+                                {{#Index}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{Name}}">{{Name}}</a>
+                                </li>
+                                {{/Index}}
+                            </ul>
+                        </details>
                     </li>
                 </ul>
             </div>

diff  --git a/clang-tools-extra/clang-doc/assets/namespace-template.mustache 
b/clang-tools-extra/clang-doc/assets/namespace-template.mustache
index 2d8381a9ea6e3..567af626714ef 100644
--- a/clang-tools-extra/clang-doc/assets/namespace-template.mustache
+++ b/clang-tools-extra/clang-doc/assets/namespace-template.mustache
@@ -16,87 +16,99 @@
                 <h2>{{#RecordType}}{{RecordType}} {{/RecordType}}{{Name}}</h2>
                 <ul>
                     {{#HasEnums}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Enums">Enums</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Enums}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Enums}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" href="#Enums">Enums</a>
+                            </summary>
+                            <ul>
+                                {{#Enums}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Enums}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasEnums}}
                     {{#HasRecords}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Classes">Inner 
Classes</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Records}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Records}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" href="#Classes">Inner 
Classes</a>
+                            </summary>
+                            <ul>
+                                {{#Records}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Records}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasRecords}}
                     {{#HasFunctions}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Functions">Functions</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Functions}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}{{#Template}}{{#Specialization}}&lt;{{#Parameters}}{{Param}}{{^End}},
 {{/End}}{{/Parameters}}&gt;{{/Specialization}}{{/Template}}</a>
-                            </li>
-                            {{/Functions}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Functions">Functions</a>
+                            </summary>
+                            <ul>
+                                {{#Functions}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}{{#Template}}{{#Specialization}}&lt;{{#Parameters}}{{Param}}{{^End}},
 {{/End}}{{/Parameters}}&gt;{{/Specialization}}{{/Template}}</a>
+                                </li>
+                                {{/Functions}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasFunctions}}
                     {{#HasNamespaces}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Namespaces}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Namespaces}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
+                            </summary>
+                            <ul>
+                                {{#Namespaces}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Namespaces}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasNamespaces}}
                     {{#HasConcepts}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Concepts">Concepts</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Concepts}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Concepts}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Concepts">Concepts</a>
+                            </summary>
+                            <ul>
+                                {{#Concepts}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Concepts}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasConcepts}}
                     {{#HasTypedefs}}
-                    <li class="sidebar-section">
-                        <a class="sidebar-item" href="#Typedefs">Typedefs</a>
-                    </li>
                     <li>
-                        <ul>
-                            {{#Typedefs}}
-                            <li class="sidebar-item-container">
-                                <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
-                            </li>
-                            {{/Typedefs}}
-                        </ul>
+                        <details open>
+                            <summary class="sidebar-section">
+                                <a class="sidebar-item" 
href="#Typedefs">Typedefs</a>
+                            </summary>
+                            <ul>
+                                {{#Typedefs}}
+                                <li class="sidebar-item-container">
+                                    <a class="sidebar-item" 
href="#{{USR}}">{{Name}}</a>
+                                </li>
+                                {{/Typedefs}}
+                            </ul>
+                        </details>
                     </li>
                     {{/HasTypedefs}}
                 </ul>

diff  --git a/clang-tools-extra/test/clang-doc/basic-project.mustache.test 
b/clang-tools-extra/test/clang-doc/basic-project.mustache.test
index 26e42280f3474..033003ce6508d 100644
--- a/clang-tools-extra/test/clang-doc/basic-project.mustache.test
+++ b/clang-tools-extra/test/clang-doc/basic-project.mustache.test
@@ -36,20 +36,24 @@ HTML-SHAPE:     <div class="container">
 HTML-SHAPE:         <div class="sidebar">
 HTML-SHAPE:             <h2>class Shape</h2>
 HTML-SHAPE:             <ul>
-HTML-SHAPE:                 <li class="sidebar-section">
-HTML-SHAPE:                     <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-SHAPE:                 <li>
+HTML-SHAPE:                     <details open>
+HTML-SHAPE:                         <summary class="sidebar-section">
+HTML-SHAPE:                             <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-SHAPE:                         </summary>
+HTML-SHAPE:                         <ul>
+HTML-SHAPE:                             <li class="sidebar-item-container">
+HTML-SHAPE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
+HTML-SHAPE:                             </li>
+HTML-SHAPE:                             <li class="sidebar-item-container">
+HTML-SHAPE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
+HTML-SHAPE:                             </li>
+HTML-SHAPE:                             <li class="sidebar-item-container">
+HTML-SHAPE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">~Shape</a>
+HTML-SHAPE:                             </li>
+HTML-SHAPE:                         </ul>
+HTML-SHAPE:                     </details>
 HTML-SHAPE:                 </li>
-HTML-SHAPE:                 <ul>
-HTML-SHAPE:                     <li class="sidebar-item-container">
-HTML-SHAPE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
-HTML-SHAPE:                     </li>
-HTML-SHAPE:                     <li class="sidebar-item-container">
-HTML-SHAPE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
-HTML-SHAPE:                     </li>
-HTML-SHAPE:                     <li class="sidebar-item-container">
-HTML-SHAPE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">~Shape</a>
-HTML-SHAPE:                     </li>
-HTML-SHAPE:                 </ul>
 HTML-SHAPE:             </ul>
 HTML-SHAPE:         </div>
 HTML-SHAPE:         <div class="resizer" id="resizer"></div>
@@ -143,37 +147,45 @@ HTML-CALC:     <div class="container">
 HTML-CALC:         <div class="sidebar">
 HTML-CALC:             <h2>class Calculator</h2>
 HTML-CALC:             <ul>
-HTML-CALC:                 <li class="sidebar-section">
-HTML-CALC:                     <a class="sidebar-item" 
href="#PublicMembers">Public Members</a>
+HTML-CALC:                 <li>
+HTML-CALC:                     <details open>
+HTML-CALC:                         <summary class="sidebar-section">
+HTML-CALC:                             <a class="sidebar-item" 
href="#PublicMembers">Public Members</a>
+HTML-CALC:                         </summary>
+HTML-CALC:                         <ul>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#public_val">public_val</a>
+HTML-CALC:                             </li>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#static_val">static_val</a>
+HTML-CALC:                             </li>
+HTML-CALC:                         </ul>
+HTML-CALC:                     </details>
 HTML-CALC:                 </li>
-HTML-CALC:                 <ul>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#public_val">public_val</a>
-HTML-CALC:                     </li>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#static_val">static_val</a>
-HTML-CALC:                     </li>
-HTML-CALC:                 </ul>
-HTML-CALC:                 <li class="sidebar-section">
-HTML-CALC:                     <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-CALC:                 <li>
+HTML-CALC:                     <details open>
+HTML-CALC:                         <summary class="sidebar-section">
+HTML-CALC:                             <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-CALC:                         </summary>
+HTML-CALC:                         <ul>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">add</a>
+HTML-CALC:                             </li>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">subtract</a>
+HTML-CALC:                             </li>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">multiply</a>
+HTML-CALC:                             </li>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">divide</a>
+HTML-CALC:                             </li>
+HTML-CALC:                             <li class="sidebar-item-container">
+HTML-CALC:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">mod</a>
+HTML-CALC:                             </li>
+HTML-CALC:                         </ul>
+HTML-CALC:                     </details>
 HTML-CALC:                 </li>
-HTML-CALC:                 <ul>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">add</a>
-HTML-CALC:                     </li>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">subtract</a>
-HTML-CALC:                     </li>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">multiply</a>
-HTML-CALC:                     </li>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">divide</a>
-HTML-CALC:                     </li>
-HTML-CALC:                     <li class="sidebar-item-container">
-HTML-CALC:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">mod</a>
-HTML-CALC:                     </li>
-HTML-CALC:                 </ul>
 HTML-CALC:             </ul>
 HTML-CALC:         </div>
 HTML-CALC:         <div class="resizer" id="resizer"></div>
@@ -344,20 +356,24 @@ HTML-RECTANGLE:     <div class="container">
 HTML-RECTANGLE:         <div class="sidebar">
 HTML-RECTANGLE:             <h2>class Rectangle</h2>
 HTML-RECTANGLE:             <ul>
-HTML-RECTANGLE:                 <li class="sidebar-section">
-HTML-RECTANGLE:                     <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-RECTANGLE:                 <li>
+HTML-RECTANGLE:                     <details open>
+HTML-RECTANGLE:                         <summary class="sidebar-section">
+HTML-RECTANGLE:                             <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-RECTANGLE:                         </summary>
+HTML-RECTANGLE:                         <ul>
+HTML-RECTANGLE:                             <li class="sidebar-item-container">
+HTML-RECTANGLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Rectangle</a>
+HTML-RECTANGLE:                             </li>
+HTML-RECTANGLE:                             <li class="sidebar-item-container">
+HTML-RECTANGLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
+HTML-RECTANGLE:                             </li>
+HTML-RECTANGLE:                             <li class="sidebar-item-container">
+HTML-RECTANGLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
+HTML-RECTANGLE:                             </li>
+HTML-RECTANGLE:                         </ul>
+HTML-RECTANGLE:                     </details>
 HTML-RECTANGLE:                 </li>
-HTML-RECTANGLE:                 <ul>
-HTML-RECTANGLE:                     <li class="sidebar-item-container">
-HTML-RECTANGLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Rectangle</a>
-HTML-RECTANGLE:                     </li>
-HTML-RECTANGLE:                     <li class="sidebar-item-container">
-HTML-RECTANGLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
-HTML-RECTANGLE:                     </li>
-HTML-RECTANGLE:                     <li class="sidebar-item-container">
-HTML-RECTANGLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
-HTML-RECTANGLE:                     </li>
-HTML-RECTANGLE:                 </ul>
 HTML-RECTANGLE:             </ul>
 HTML-RECTANGLE:         </div>
 HTML-RECTANGLE:         <div class="resizer" id="resizer"></div>
@@ -459,20 +475,24 @@ HTML-CIRCLE:     <div class="container">
 HTML-CIRCLE:         <div class="sidebar">
 HTML-CIRCLE:             <h2>class Circle</h2>
 HTML-CIRCLE:             <ul>
-HTML-CIRCLE:                 <li class="sidebar-section">
-HTML-CIRCLE:                     <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-CIRCLE:                 <li>
+HTML-CIRCLE:                     <details open>
+HTML-CIRCLE:                         <summary class="sidebar-section">
+HTML-CIRCLE:                             <a class="sidebar-item" 
href="#PublicMethods">Public Method</a>
+HTML-CIRCLE:                         </summary>
+HTML-CIRCLE:                         <ul>
+HTML-CIRCLE:                             <li class="sidebar-item-container">
+HTML-CIRCLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Circle</a>
+HTML-CIRCLE:                             </li>
+HTML-CIRCLE:                             <li class="sidebar-item-container">
+HTML-CIRCLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
+HTML-CIRCLE:                             </li>
+HTML-CIRCLE:                             <li class="sidebar-item-container">
+HTML-CIRCLE:                                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
+HTML-CIRCLE:                             </li>
+HTML-CIRCLE:                         </ul>
+HTML-CIRCLE:                     </details>
 HTML-CIRCLE:                 </li>
-HTML-CIRCLE:                 <ul>
-HTML-CIRCLE:                     <li class="sidebar-item-container">
-HTML-CIRCLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Circle</a>
-HTML-CIRCLE:                     </li>
-HTML-CIRCLE:                     <li class="sidebar-item-container">
-HTML-CIRCLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">area</a>
-HTML-CIRCLE:                     </li>
-HTML-CIRCLE:                     <li class="sidebar-item-container">
-HTML-CIRCLE:                         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">perimeter</a>
-HTML-CIRCLE:                     </li>
-HTML-CIRCLE:                 </ul>
 HTML-CIRCLE:             </ul>
 HTML-CIRCLE:         </div>
 HTML-CIRCLE:         <div class="resizer" id="resizer"></div>

diff  --git a/clang-tools-extra/test/clang-doc/index.cpp 
b/clang-tools-extra/test/clang-doc/index.cpp
index e9ac164768170..5ff183f8d80ad 100644
--- a/clang-tools-extra/test/clang-doc/index.cpp
+++ b/clang-tools-extra/test/clang-doc/index.cpp
@@ -27,18 +27,20 @@ namespace inner {
 // CHECK-HTML-NEXT:            <div class="sidebar">
 // CHECK-HTML-NEXT:                <h2></h2>
 // CHECK-HTML-NEXT:                <ul>
-// CHECK-HTML-NEXT:                    <li class="sidebar-section">
-// CHECK-HTML-NEXT:                        <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
-// CHECK-HTML-NEXT:                    </li>
 // CHECK-HTML-NEXT:                    <li>
-// CHECK-HTML-NEXT:                        <ul>
-// CHECK-HTML-NEXT:                            <li 
class="sidebar-item-container">
-// CHECK-HTML-NEXT:                                <a class="sidebar-item" 
href="#GlobalNamespace">GlobalNamespace</a>
-// CHECK-HTML-NEXT:                            </li>
-// CHECK-HTML-NEXT:                            <li 
class="sidebar-item-container">
-// CHECK-HTML-NEXT:                                <a class="sidebar-item" 
href="#inner">inner</a>
-// CHECK-HTML-NEXT:                            </li>
-// CHECK-HTML-NEXT:                        </ul>
+// CHECK-HTML-NEXT:                        <details open>
+// CHECK-HTML-NEXT:                            <summary 
class="sidebar-section">
+// CHECK-HTML-NEXT:                                <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
+// CHECK-HTML-NEXT:                            </summary>
+// CHECK-HTML-NEXT:                            <ul>
+// CHECK-HTML-NEXT:                                <li 
class="sidebar-item-container">
+// CHECK-HTML-NEXT:                                    <a class="sidebar-item" 
href="#GlobalNamespace">GlobalNamespace</a>
+// CHECK-HTML-NEXT:                                </li>
+// CHECK-HTML-NEXT:                                <li 
class="sidebar-item-container">
+// CHECK-HTML-NEXT:                                    <a class="sidebar-item" 
href="#inner">inner</a>
+// CHECK-HTML-NEXT:                                </li>
+// CHECK-HTML-NEXT:                            </ul>
+// CHECK-HTML-NEXT:                        </details> 
 // CHECK-HTML-NEXT:                    </li>
 // CHECK-HTML-NEXT:                </ul>
 // CHECK-HTML-NEXT:            </div>

diff  --git a/clang-tools-extra/test/clang-doc/json/class.cpp 
b/clang-tools-extra/test/clang-doc/json/class.cpp
index 936d2c5b10571..c0270723409f7 100644
--- a/clang-tools-extra/test/clang-doc/json/class.cpp
+++ b/clang-tools-extra/test/clang-doc/json/class.cpp
@@ -291,26 +291,24 @@ struct MyClass {
 // CHECK-NEXT:  }
 
 // HTML:              <a class="sidebar-item" href="#Classes">Inner Classes</a>
-// HTML-NEXT:     </li>
-// HTML-NEXT:     <li>
-// HTML-NEXT:         <ul>
-// HTML-NEXT:             <li class="sidebar-item-container">
-// HTML-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">NestedClass</a>
-// HTML-NEXT:             </li>
-// HTML-NEXT:         </ul>
-// HTML-NEXT:     </li>
+// HTML-NEXT:     </summary>
+// HTML-NEXT:     <ul>
+// HTML-NEXT:         <li class="sidebar-item-container">
+// HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">NestedClass</a>
+// HTML-NEXT:         </li>
+// HTML-NEXT:     </ul>
+// HTML-NEXT: </details>
 // HTML:              <a class="sidebar-item" href="#Friends">Friends</a>
-// HTML-NEXT:     </li>
-// HTML-NEXT:     <li>
-// HTML-NEXT:         <ul>
-// HTML-NEXT:             <li class="sidebar-item-container">
-// HTML-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">friendFunction</a>
-// HTML-NEXT:             </li>
-// HTML-NEXT:             <li class="sidebar-item-container">
-// HTML-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Foo</a>
-// HTML-NEXT:             </li>
-// HTML-NEXT:         </ul>
-// HTML-NEXT:     </li>
+// HTML-NEXT:     </summary>
+// HTML-NEXT:     <ul>
+// HTML-NEXT:         <li class="sidebar-item-container">
+// HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">friendFunction</a>
+// HTML-NEXT:         </li>
+// HTML-NEXT:         <li class="sidebar-item-container">
+// HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Foo</a>
+// HTML-NEXT:         </li>
+// HTML-NEXT:     </ul>
+// HTML-NEXT: </details>
 // HTML:      <section id="Classes" class="section-container">
 // HTML-NEXT:     <h2>Inner Classes</h2>
 // HTML-NEXT:     <ul class="class-container">

diff  --git a/clang-tools-extra/test/clang-doc/json/compound-constraints.cpp 
b/clang-tools-extra/test/clang-doc/json/compound-constraints.cpp
index 1c5a92149b995..e741bbfd53466 100644
--- a/clang-tools-extra/test/clang-doc/json/compound-constraints.cpp
+++ b/clang-tools-extra/test/clang-doc/json/compound-constraints.cpp
@@ -127,23 +127,21 @@ template<typename T> requires (Incrementable<T> && 
Decrementable<T>) || PreIncre
 // CHECK-NEXT:      ],
 
 // CHECK-HTML:          <a class="sidebar-item" href="#Concepts">Concepts</a>
-// CHECK-HTML-NEXT: </li>
-// CHECK-HTML-NEXT: <li>
-// CHECK-HTML-NEXT:     <ul>
-// CHECK-HTML-NEXT:         <li class="sidebar-item-container">
-// CHECK-HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Incrementable</a>
-// CHECK-HTML-NEXT:         </li>
-// CHECK-HTML-NEXT:         <li class="sidebar-item-container">
-// CHECK-HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Decrementable</a>
-// CHECK-HTML-NEXT:         </li>
-// CHECK-HTML-NEXT:         <li class="sidebar-item-container">
-// CHECK-HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">PreIncrementable</a>
-// CHECK-HTML-NEXT:         </li>
-// CHECK-HTML-NEXT:         <li class="sidebar-item-container">
-// CHECK-HTML-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">PreDecrementable</a>
-// CHECK-HTML-NEXT:         </li>
-// CHECK-HTML-NEXT:     </ul>
-// CHECK-HTML-NEXT: </li>
+// CHECK-HTML-NEXT: </summary>
+// CHECK-HTML-NEXT: <ul>
+// CHECK-HTML-NEXT:     <li class="sidebar-item-container">
+// CHECK-HTML-NEXT:         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Incrementable</a>
+// CHECK-HTML-NEXT:     </li>
+// CHECK-HTML-NEXT:     <li class="sidebar-item-container">
+// CHECK-HTML-NEXT:         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Decrementable</a>
+// CHECK-HTML-NEXT:     </li>
+// CHECK-HTML-NEXT:     <li class="sidebar-item-container">
+// CHECK-HTML-NEXT:         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">PreIncrementable</a>
+// CHECK-HTML-NEXT:     </li>
+// CHECK-HTML-NEXT:     <li class="sidebar-item-container">
+// CHECK-HTML-NEXT:         <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">PreDecrementable</a>
+// CHECK-HTML-NEXT:     </li>
+// CHECK-HTML-NEXT: </ul>
 // CHECK-HTML:      <section id="Concepts" class="section-container">
 // CHECK-HTML-NEXT:     <h2>Concepts</h2>
 // CHECK-HTML-NEXT:     <div id="" class="delimiter-container">
@@ -157,7 +155,7 @@ template<typename T> requires (Incrementable<T> && 
Decrementable<T>) || PreIncre
 // CHECK-HTML-NEXT:         <div>
 // CHECK-HTML-NEXT:             <b>T</b>   A value that can be incremented.
 // CHECK-HTML-NEXT:         </div> 
-// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-151]] of file 
{{.*}}compound-constraints.cpp</p>
+// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-149]] of file 
{{.*}}compound-constraints.cpp</p>
 // CHECK-HTML-NEXT:     </div>
 // CHECK-HTML-NEXT:     <div id="" class="delimiter-container">
 // CHECK-HTML-NEXT:         <div>
@@ -170,7 +168,7 @@ template<typename T> requires (Incrementable<T> && 
Decrementable<T>) || PreIncre
 // CHECK-HTML-NEXT:         <div>
 // CHECK-HTML-NEXT:             <b>T</b>   A value that can be decremented
 // CHECK-HTML-NEXT:         </div> 
-// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-157]] of file 
{{.*}}compound-constraints.cpp</p>
+// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-155]] of file 
{{.*}}compound-constraints.cpp</p>
 // CHECK-HTML-NEXT:     </div>
 // CHECK-HTML-NEXT:     <div id="" class="delimiter-container">
 // CHECK-HTML-NEXT:         <div>
@@ -183,7 +181,7 @@ template<typename T> requires (Incrementable<T> && 
Decrementable<T>) || PreIncre
 // CHECK-HTML-NEXT:         <div>
 // CHECK-HTML-NEXT:             <b>T</b>   A value that can be pre-incremented
 // CHECK-HTML-NEXT:         </div> 
-// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-163]] of file 
{{.*}}compound-constraints.cpp</p>
+// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-161]] of file 
{{.*}}compound-constraints.cpp</p>
 // CHECK-HTML-NEXT:     </div>
 // CHECK-HTML-NEXT:     <div id="" class="delimiter-container">
 // CHECK-HTML-NEXT:         <div>
@@ -196,6 +194,6 @@ template<typename T> requires (Incrementable<T> && 
Decrementable<T>) || PreIncre
 // CHECK-HTML-NEXT:         <div>
 // CHECK-HTML-NEXT:             <b>T</b>   A value that can be pre-decremented
 // CHECK-HTML-NEXT:         </div> 
-// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-169]] of file 
{{.*}}compound-constraints.cpp</p>
+// CHECK-HTML-NEXT:         <p>Defined at line [[@LINE-167]] of file 
{{.*}}compound-constraints.cpp</p>
 // CHECK-HTML-NEXT:     </div>
 // CHECK-HTML-NEXT: </section>

diff  --git a/clang-tools-extra/test/clang-doc/mustache-index.cpp 
b/clang-tools-extra/test/clang-doc/mustache-index.cpp
index 0aa6e21c37cac..9706307287f9b 100644
--- a/clang-tools-extra/test/clang-doc/mustache-index.cpp
+++ b/clang-tools-extra/test/clang-doc/mustache-index.cpp
@@ -10,24 +10,22 @@ enum Color {
 
 class Foo;
 
-// CHECK:       <li class="sidebar-section">
+// CHECK:       <summary class="sidebar-section">
 // CHECK-NEXT:      <a class="sidebar-item" href="#Enums">Enums</a>
-// CHECK-NEXT:  </li>
-// CHECK-NEXT:  <li>
-// CHECK-NEXT:      <ul>
-// CHECK-NEXT:          <li class="sidebar-item-container">
-// CHECK-NEXT:              <a class="sidebar-item" 
href="#{{[0-9A-F]*}}">Color</a>
-// CHECK-NEXT:          </li>
-// CHECK-NEXT:      </ul>
-// CHECK:           <li class="sidebar-section">
-// CHECK-NEXT:          <a class="sidebar-item" href="#Classes">Inner 
Classes</a>
+// CHECK-NEXT:  </summary>
+// CHECK-NEXT:  <ul>
+// CHECK-NEXT:      <li class="sidebar-item-container">
+// CHECK-NEXT:          <a class="sidebar-item" href="#{{[0-9A-F]*}}">Color</a>
 // CHECK-NEXT:      </li>
-// CHECK-NEXT:  <li>
-// CHECK-NEXT:      <ul>
-// CHECK-NEXT:          <li class="sidebar-item-container">
-// CHECK-NEXT:              <a class="sidebar-item" 
href="#{{[0-9A-F]*}}">Foo</a>
-// CHECK-NEXT:          </li>
-// CHECK-NEXT:      </ul>
+// CHECK-NEXT:  </ul>
+// CHECK:       <summary class="sidebar-section">
+// CHECK-NEXT:      <a class="sidebar-item" href="#Classes">Inner Classes</a>
+// CHECK-NEXT:  </summary>
+// CHECK-NEXT:  <ul>
+// CHECK-NEXT:      <li class="sidebar-item-container">
+// CHECK-NEXT:          <a class="sidebar-item" href="#{{[0-9A-F]*}}">Foo</a>
+// CHECK-NEXT:      </li>
+// CHECK-NEXT:  </ul>
 
 // CHECK:       <section id="Enums" class="section-container">
 // CHECK-NEXT:      <h2>Enumerations</h2>

diff  --git a/clang-tools-extra/test/clang-doc/mustache-separate-namespace.cpp 
b/clang-tools-extra/test/clang-doc/mustache-separate-namespace.cpp
index 00aa6e9e8d12d..c0fa2b47a3983 100644
--- a/clang-tools-extra/test/clang-doc/mustache-separate-namespace.cpp
+++ b/clang-tools-extra/test/clang-doc/mustache-separate-namespace.cpp
@@ -21,15 +21,17 @@ namespace MyNamespace {
 // CHECK-GLOBAL-NEXT:                <div class="sidebar">
 // CHECK-GLOBAL-NEXT:                    <h2>Global Namespace</h2>
 // CHECK-GLOBAL-NEXT:                    <ul>
-// CHECK-GLOBAL-NEXT:                        <li class="sidebar-section">
-// CHECK-GLOBAL-NEXT:                            <a class="sidebar-item" 
href="#Namespaces">Namespaces</a>
-// CHECK-GLOBAL-NEXT:                        </li>
 // CHECK-GLOBAL-NEXT:                        <li>
-// CHECK-GLOBAL-NEXT:                            <ul>
-// CHECK-GLOBAL-NEXT:                                <li 
class="sidebar-item-container">
-// CHECK-GLOBAL-NEXT:                                    <a 
class="sidebar-item" href="#{{[0-9A-F]*}}">MyNamespace</a>
-// CHECK-GLOBAL-NEXT:                                </li>
-// CHECK-GLOBAL-NEXT:                            </ul>
+// CHECK-GLOBAL-NEXT:                            <details open>
+// CHECK-GLOBAL-NEXT:                                <summary 
class="sidebar-section">
+// CHECK-GLOBAL-NEXT:                                    <a 
class="sidebar-item" href="#Namespaces">Namespaces</a>
+// CHECK-GLOBAL-NEXT:                                </summary>
+// CHECK-GLOBAL-NEXT:                                <ul>
+// CHECK-GLOBAL-NEXT:                                    <li 
class="sidebar-item-container">
+// CHECK-GLOBAL-NEXT:                                        <a 
class="sidebar-item" href="#{{[0-9A-F]*}}">MyNamespace</a>
+// CHECK-GLOBAL-NEXT:                                    </li>
+// CHECK-GLOBAL-NEXT:                                </ul>
+// CHECK-GLOBAL-NEXT:                            </details>
 // CHECK-GLOBAL-NEXT:                        </li>
 // CHECK-GLOBAL-NEXT:                    </ul>
 // CHECK-GLOBAL-NEXT:                </div>

diff  --git a/clang-tools-extra/test/clang-doc/typedef-alias.cpp 
b/clang-tools-extra/test/clang-doc/typedef-alias.cpp
index dec2bc5883a09..22ad67dd05b16 100644
--- a/clang-tools-extra/test/clang-doc/typedef-alias.cpp
+++ b/clang-tools-extra/test/clang-doc/typedef-alias.cpp
@@ -21,23 +21,21 @@ template<typename T> using Vec = Vector<T>;
 using IntVec = Vector<int>;
 
 // HTML-GLOBAL:              <a class="sidebar-item" 
href="#Typedefs">Typedefs</a>
-// HTML-GLOBAL-NEXT:     </li>
-// HTML-GLOBAL-NEXT:     <li>
-// HTML-GLOBAL-NEXT:         <ul>
-// HTML-GLOBAL-NEXT:             <li class="sidebar-item-container">
-// HTML-GLOBAL-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">u_long</a>
-// HTML-GLOBAL-NEXT:             </li>
-// HTML-GLOBAL-NEXT:             <li class="sidebar-item-container">
-// HTML-GLOBAL-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">IntPtr</a>
-// HTML-GLOBAL-NEXT:             </li>
-// HTML-GLOBAL-NEXT:             <li class="sidebar-item-container">
-// HTML-GLOBAL-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Vec</a>
-// HTML-GLOBAL-NEXT:             </li>
-// HTML-GLOBAL-NEXT:             <li class="sidebar-item-container">
-// HTML-GLOBAL-NEXT:                 <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">IntVec</a>
-// HTML-GLOBAL-NEXT:             </li>
-// HTML-GLOBAL-NEXT:         </ul>
-// HTML-GLOBAL-NEXT:     </li>
+// HTML-GLOBAL-NEXT:     </summary>
+// HTML-GLOBAL-NEXT:     <ul>
+// HTML-GLOBAL-NEXT:         <li class="sidebar-item-container">
+// HTML-GLOBAL-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">u_long</a>
+// HTML-GLOBAL-NEXT:         </li>
+// HTML-GLOBAL-NEXT:         <li class="sidebar-item-container">
+// HTML-GLOBAL-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">IntPtr</a>
+// HTML-GLOBAL-NEXT:         </li>
+// HTML-GLOBAL-NEXT:         <li class="sidebar-item-container">
+// HTML-GLOBAL-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Vec</a>
+// HTML-GLOBAL-NEXT:         </li>
+// HTML-GLOBAL-NEXT:         <li class="sidebar-item-container">
+// HTML-GLOBAL-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">IntVec</a>
+// HTML-GLOBAL-NEXT:         </li>
+// HTML-GLOBAL-NEXT:     </ul>
 // HTML-GLOBAL:      <section id="Typedefs" class="section-container">
 // HTML-GLOBAL-NEXT:     <h2>Typedefs</h2>
 // HTML-GLOBAL-NEXT:     <div id="{{([0-9A-F]{40})}}" 
class="delimiter-container">
@@ -65,14 +63,11 @@ using IntVec = Vector<int>;
 // HTML-GLOBAL-NEXT:     </div>
 // HTML-GLOBAL-NEXT: </section>
 
-// HTML-VECTOR:                  <a class="sidebar-item" 
href="#Typedefs">Typedefs</a>
-// HTML-VECTOR-NEXT:         </li>
-// HTML-VECTOR-NEXT:         <li>
-// HTML-VECTOR-NEXT:             <ul>
-// HTML-VECTOR-NEXT:                 <li class="sidebar-item-container">
-// HTML-VECTOR-NEXT:                     <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Ptr</a>
-// HTML-VECTOR-NEXT:                 </li>
-// HTML-VECTOR-NEXT:             </ul>
+// HTML-VECTOR:              <a class="sidebar-item" 
href="#Typedefs">Typedefs</a>
+// HTML-VECTOR-NEXT:     </summary>
+// HTML-VECTOR-NEXT:     <ul>
+// HTML-VECTOR-NEXT:         <li class="sidebar-item-container">
+// HTML-VECTOR-NEXT:             <a class="sidebar-item" 
href="#{{([0-9A-F]{40})}}">Ptr</a>
 // HTML-VECTOR-NEXT:         </li>
 // HTML-VECTOR-NEXT:     </ul>
 // HTML-VECTOR:      <section id="Typedefs" class="section-container">


        
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