Rollup merge of #129545 - notriddle:notriddle/toolbar-v2, r=GuillaumeGomez

rustdoc: redesign toolbar and disclosure widgets

Fixes #77899
Fixes #90310

## Preview

| before | after
| ------ | -----
| ![image](https://github.com/user-attachments/assets/ebeec185-3a72-481d-921e-a9a885f348d9) | ![image](https://github.com/user-attachments/assets/08735a65-99d1-4523-ab77-ddb164c0a5db)
| ![image](https://github.com/user-attachments/assets/ae8e0f24-49cb-445d-b9bd-cec9c57b94e7) | ![image](https://github.com/user-attachments/assets/ba484f94-b031-41fc-b8a8-6cd81be8fb6b)
| ![image](https://github.com/user-attachments/assets/8c2cc041-a138-4950-a12e-3d529c8a5339) | ![image](https://github.com/user-attachments/assets/e7f010bd-19e2-4711-85bf-3fd00c3e5647)
| ![image](https://github.com/user-attachments/assets/e2b63785-971c-489e-b069-eb85f6a30620) | ![image](https://github.com/user-attachments/assets/b65eea16-d6a3-4aa3-8a27-6ded74009010)
| ![image](https://github.com/user-attachments/assets/1c7b0901-a61a-4325-9d01-9d8b14b476aa) | ![image](https://github.com/user-attachments/assets/d4a485db-d9f1-4a62-94bc-a3d125ea6dc1)
| N/A | ![image](https://github.com/user-attachments/assets/7add0a2a-7fd7-483d-87ee-51ee45a2fe5d)
| ![image](https://github.com/user-attachments/assets/334f50bc-9f8d-42d9-a7df-95058f7cdfd5) | ![image](https://github.com/user-attachments/assets/451fcc22-b034-453c-ae4b-b948fd6bd779)
| ![image](https://github.com/user-attachments/assets/132f720c-802a-466d-bd55-c7a4750acdc3) | ![image](https://github.com/user-attachments/assets/177b7921-06c5-467d-87d3-9cdf88c4e50b)

https://notriddle.com/rustdoc-html-demo-12/toolbar-v2/std/index.html

## Description

This adds labels to the icons and moves them away from the search box.

These changes are made together, because they work together, but are based on several complaints:

* The [+/-] thing are a Reddit-ism. They don't look like buttons, but look like syntax <https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/More.20visual.20difference.20for.20the.20.2B.2F-.20.20Icons>, <https://github.com/rust-lang/rust/issues/59851> (some of these are laundry lists with more suggestions, but they all mention [+/-] looking wrong)

* The settings, help, and summary buttons are also too hard to recognize <https://lwn.net/Articles/987070/>, <https://github.com/rust-lang/rust/issues/90310>, <https://github.com/rust-lang/rust/issues/14475#issuecomment-274241997>, <https://internals.rust-lang.org/t/improve-rustdoc-design/12758> ("Not all functionality is self-explanatory, for example the [+] button in the top right corner, the theme picker or the settings button.")

The toggle-all and toggle-individual buttons both need done at once, since we want them to look like they go together. This changes them from both being [+/-] to both being arrows.

CC <https://github.com/rust-lang/rust/pull/113074#issuecomment-1677469680> and ``@jsha`` regarding the use of triangles for disclosure, which is what everyone wanted, but was pending a good toggle-all button. This PR adds a toggle-all button that should work.

Settings and Help are also migrated, so that the whole group can benefit from being described using actual words.

The breadcrumbs also get redesigned, so that they use less space, by shrinking the parent module path parts. This is done at the same time as the toolbar redesign because it's, effectively, moving space from the toolbar to the breadcrumbs.
This is aimed at avoiding any line wrapping at desktop sizes.

## Prior art

This style of toolbar, with explicit labels on the buttons, used to be more popular. It's not very common in web browsers nowadays, and for truly universal icons like :arrow_left: I can understand why, but words are great when icons fail.

![image](https://github.com/user-attachments/assets/9a4a0498-232d-4d60-87b9-f601f4515254)

9 files changed, 370 insertions, 172 deletions

diff --git a/src/librustdoc/html/sources.rs b/src/librustdoc/html/sources.rs
index c8c45b8fa32..9ba0fb7b83c 100644
--- a/src/librustdoc/html/sources.rs
+++ b/src/librustdoc/html/sources.rs
@@ -26,8 +26,11 @@ pub(crate) fn render(cx: &mut Context<'_>, krate: &clean::Crate) -> Result<(), E
 
     let dst = cx.dst.join("src").join(krate.name(cx.tcx()).as_str());
     cx.shared.ensure_dir(&dst)?;
+    let crate_name = krate.name(cx.tcx());
+    let crate_name = crate_name.as_str();
 
-    let mut collector = SourceCollector { dst, cx, emitted_local_sources: FxHashSet::default() };
+    let mut collector =
+        SourceCollector { dst, cx, emitted_local_sources: FxHashSet::default(), crate_name };
     collector.visit_crate(krate);
     Ok(())
 }
@@ -115,6 +118,8 @@ struct SourceCollector<'a, 'tcx> {
     /// Root destination to place all HTML output into
     dst: PathBuf,
     emitted_local_sources: FxHashSet<PathBuf>,
+
+    crate_name: &'a str,
 }
 
 impl DocVisitor for SourceCollector<'_, '_> {
@@ -210,6 +215,9 @@ impl SourceCollector<'_, '_> {
             },
         );
 
+        let src_fname = p.file_name().expect("source has no filename").to_os_string();
+        let mut fname = src_fname.clone();
+
         let root_path = PathBuf::from("../../").join(root_path.into_inner());
         let mut root_path = root_path.to_string_lossy();
         if let Some(c) = root_path.as_bytes().last()
@@ -217,12 +225,12 @@ impl SourceCollector<'_, '_> {
         {
             root_path += "/";
         }
+        let mut file_path = Path::new(&self.crate_name).join(&*cur.borrow());
+        file_path.push(&fname);
+        fname.push(".html");
         let mut cur = self.dst.join(cur.into_inner());
         shared.ensure_dir(&cur)?;
 
-        let src_fname = p.file_name().expect("source has no filename").to_os_string();
-        let mut fname = src_fname.clone();
-        fname.push(".html");
         cur.push(&fname);
 
         let title = format!("{} - source", src_fname.to_string_lossy());
@@ -250,7 +258,7 @@ impl SourceCollector<'_, '_> {
                     cx,
                     &root_path,
                     highlight::DecorationInfo::default(),
-                    SourceContext::Standalone,
+                    SourceContext::Standalone { file_path },
                 )
             },
             &shared.style_files,
@@ -312,10 +320,11 @@ struct ScrapedSource<'a, Code: std::fmt::Display> {
 struct Source<Code: std::fmt::Display> {
     lines: RangeInclusive<usize>,
     code_html: Code,
+    file_path: Option<(String, String)>,
 }
 
 pub(crate) enum SourceContext<'a> {
-    Standalone,
+    Standalone { file_path: PathBuf },
     Embedded(ScrapedInfo<'a>),
 }
 
@@ -344,9 +353,19 @@ pub(crate) fn print_src(
     });
     let lines = s.lines().count();
     match source_context {
-        SourceContext::Standalone => {
-            Source { lines: (1..=lines), code_html: code }.render_into(&mut writer).unwrap()
+        SourceContext::Standalone { file_path } => Source {
+            lines: (1..=lines),
+            code_html: code,
+            file_path: if let Some(file_name) = file_path.file_name()
+                && let Some(file_path) = file_path.parent()
+            {
+                Some((file_path.display().to_string(), file_name.display().to_string()))
+            } else {
+                None
+            },
         }
+        .render_into(&mut writer)
+        .unwrap(),
         SourceContext::Embedded(info) => {
             let lines = (1 + info.offset)..=(lines + info.offset);
             ScrapedSource { info, lines, code_html: code }.render_into(&mut writer).unwrap();
diff --git a/src/librustdoc/html/static/css/noscript.css b/src/librustdoc/html/static/css/noscript.css
index e62b16267f1..477a79d63e9 100644
--- a/src/librustdoc/html/static/css/noscript.css
+++ b/src/librustdoc/html/static/css/noscript.css
@@ -61,6 +61,8 @@ nav.sub {
 	--copy-path-img-hover-filter: invert(35%);
 	--code-example-button-color: #7f7f7f;
 	--code-example-button-hover-color: #595959;
+	--settings-menu-filter: invert(50%);
+	--settings-menu-hover-filter: invert(35%);
 	--codeblock-error-hover-color: rgb(255, 0, 0);
 	--codeblock-error-color: rgba(255, 0, 0, .5);
 	--codeblock-ignore-hover-color: rgb(255, 142, 0);
@@ -87,7 +89,6 @@ nav.sub {
 	--search-tab-button-not-selected-background: #e6e6e6;
 	--search-tab-button-selected-border-top-color: #0089ff;
 	--search-tab-button-selected-background: #fff;
-	--settings-menu-filter: none;
 	--stab-background-color: #fff5d6;
 	--stab-code-color: #000;
 	--code-highlight-kw-color: #8959a8;
@@ -192,6 +193,8 @@ nav.sub {
 		--search-tab-button-not-selected-background: #252525;
 		--search-tab-button-selected-border-top-color: #0089ff;
 		--search-tab-button-selected-background: #353535;
+		--settings-menu-filter: invert(50%);
+		--settings-menu-hover-filter: invert(65%);
 		--stab-background-color: #314559;
 		--stab-code-color: #e6e1cf;
 		--code-highlight-kw-color: #ab8ac1;
diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 04b0eba7450..ae9727a4d4f 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -34,6 +34,8 @@ xmlns="http://www.w3.org/2000/svg" fill="black" height="18px">\
 </g></svg>');
 	--button-left-margin: 4px;
 	--button-border-radius: 2px;
+	--toolbar-button-border-radius: 6px;
+	--code-block-border-radius: 6px;
 }
 
 /* See FiraSans-LICENSE.txt for the Fira Sans license. */
@@ -165,7 +167,7 @@ h1, h2, h3, h4 {
 .main-heading h1 {
 	margin: 0;
 	padding: 0;
-	flex-grow: 1;
+	grid-area: main-heading-h1;
 	/* We use overflow-wrap: break-word for Safari, which doesn't recognize
 	   `anywhere`: https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-wrap */
 	overflow-wrap: break-word;
@@ -174,10 +176,28 @@ h1, h2, h3, h4 {
 	overflow-wrap: anywhere;
 }
 .main-heading {
-	display: flex;
-	flex-wrap: wrap;
+	position: relative;
+	display: grid;
+	grid-template-areas:
+		"main-heading-breadcrumbs main-heading-breadcrumbs"
+		"main-heading-h1 main-heading-toolbar"
+		"main-heading-sub-heading main-heading-toolbar";
+	grid-template-columns: 1fr max-content;
+	grid-template-rows: 25px min-content min-content;
 	padding-bottom: 6px;
-	margin-bottom: 15px;
+	margin-bottom: 11px;
+}
+.rustdoc-breadcrumbs {
+	grid-area: main-heading-breadcrumbs;
+	height: 25px;
+	line-height: 1.25;
+	display: flex;
+	align-items: end;
+}
+.rustdoc-breadcrumbs a {
+	padding: 4px 0;
+	margin: -4px 0;
+	z-index: 1;
 }
 /* The only headings that get underlines are:
 	 Markdown-generated headings within the top-doc
@@ -218,11 +238,13 @@ h1, h2, h3, h4, h5, h6,
 .search-results .result-name,
 .item-name > a,
 .out-of-band,
+.sub-heading,
 span.since,
 a.src,
-#help-button > a,
+rustdoc-toolbar,
 summary.hideme,
 .scraped-example-list,
+.rustdoc-breadcrumbs,
 /* This selector is for the items listed in the "all items" page. */
 ul.all-items {
 	font-family: "Fira Sans", Arial, NanumBarunGothic, sans-serif;
@@ -891,14 +913,27 @@ both the code example and the line numbers, so we need to remove the radius in t
 	overflow-x: auto;
 }
 
-.out-of-band {
+.sub-heading {
+	font-size: 1rem;
 	flex-grow: 0;
-	font-size: 1.125rem;
+	grid-area: main-heading-sub-heading;
+	line-height: 1.25;
+	padding-bottom: 4px;
+}
+
+.main-heading rustdoc-toolbar, .main-heading .out-of-band {
+	grid-area: main-heading-toolbar;
+}
+rustdoc-toolbar {
+	display: flex;
+	flex-direction: row;
+	flex-wrap: nowrap;
 }
 
 .docblock code, .docblock-short code,
 pre, .rustdoc.src .example-wrap, .example-wrap .src-line-numbers {
 	background-color: var(--code-block-background-color);
+	border-radius: var(--code-block-border-radius);
 }
 
 #main-content {
@@ -945,7 +980,7 @@ div.where {
 nav.sub {
 	flex-grow: 1;
 	flex-flow: row nowrap;
-	margin: 4px 0 25px 0;
+	margin: 4px 0 0 0;
 	display: flex;
 	align-items: center;
 }
@@ -956,7 +991,7 @@ nav.sub {
 	flex-grow: 1;
 }
 .src nav.sub {
-	margin: 0 0 15px 0;
+	margin: 0 0 -10px 0;
 }
 
 .section-header {
@@ -1066,6 +1101,11 @@ table,
 	with boxes (i.e. from the flex layout) */
 	align-items: baseline;
 }
+.search-results-title + .sub-heading {
+	color: var(--main-color);
+	display: flex;
+	align-items: center;
+}
 #crate-search-div {
 	/* ensures that 100% in properties of #crate-search-div:after
 	are relative to the size of this div */
@@ -1289,10 +1329,16 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	border-color: var(--settings-input-color) !important;
 }
 
+#settings.popover {
+	--popover-arrow-offset: 202px;
+	top: calc(100% - 16px);
+}
+
 /* use larger max-width for help popover, but not for help.html */
 #help.popover {
 	max-width: 600px;
-	--popover-arrow-offset: 48px;
+	--popover-arrow-offset: 118px;
+	top: calc(100% - 16px);
 }
 
 #help dt {
@@ -1300,10 +1346,15 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	clear: left;
 	margin-right: 0.5rem;
 }
+#help dd {
+	margin-bottom: 0.5rem;
+}
 #help span.top, #help span.bottom {
 	text-align: center;
 	display: block;
 	font-size: 1.125rem;
+	padding: 0 0.5rem;
+	text-wrap-style: balance;
 }
 #help span.top {
 	margin: 10px 0;
@@ -1315,10 +1366,13 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	clear: both;
 	border-top: 1px solid var(--border-color);
 }
+.side-by-side {
+	display: flex;
+	margin-bottom: 20px;
+}
 .side-by-side > div {
 	width: 50%;
-	float: left;
-	padding: 0 20px 20px 17px;
+	padding: 0 20px 0 17px;
 }
 
 .item-info .stab {
@@ -1381,7 +1435,9 @@ so that we can apply CSS-filters to change the arrow color in themes */
 }
 
 .rightside:not(a),
-.out-of-band {
+.out-of-band,
+.sub-heading,
+rustdoc-toolbar {
 	color: var(--right-side-color);
 }
 
@@ -1595,8 +1651,8 @@ instead, we check that it's not a "finger" cursor.
 	display: block;
 }
 
-.out-of-band > span.since {
-	font-size: 1.25rem;
+.main-heading span.since::before {
+	content: "Since ";
 }
 
 .sub-variant h4 {
@@ -1698,6 +1754,7 @@ a.tooltip:hover::after {
 }
 
 #search-tabs {
+	margin-top: 0.25rem;
 	display: flex;
 	flex-direction: row;
 	gap: 1px;
@@ -1759,9 +1816,10 @@ a.tooltip:hover::after {
 	border-bottom: 1px solid var(--border-color);
 }
 
-#settings-menu, #help-button {
+#settings-menu, #help-button, button#toggle-all-docs {
 	margin-left: var(--button-left-margin);
 	display: flex;
+	line-height: 1.25;
 }
 #sidebar-button {
 	display: none;
@@ -1785,33 +1843,36 @@ a.tooltip:hover::after {
 .hide-sidebar .src #sidebar-button {
 	position: static;
 }
-#settings-menu > a, #help-button > a, #sidebar-button > a {
+#settings-menu > a, #help-button > a, #sidebar-button > a, button#toggle-all-docs {
 	display: flex;
 	align-items: center;
 	justify-content: center;
-	background-color: var(--button-background-color);
-	border: 1px solid var(--border-color);
+	flex-direction: column;
+	border: 1px solid transparent;
 	border-radius: var(--button-border-radius);
-	color: var(--settings-button-color);
-	/* Rare exception to specifying font sizes in rem. Since this is acting
-	   as an icon, it's okay to specify their sizes in pixels. */
-	font-size: 20px;
+	color: var(--main-color);
+}
+#settings-menu > a, #help-button > a, button#toggle-all-docs {
+	width: 80px;
+	border-radius: var(--toolbar-button-border-radius);
+}
+#sidebar-button > a {
+	background-color: var(--button-background-color);
+	border-color: var(--border-color);
 	width: 33px;
 }
 
-#settings-menu > a:hover, #settings-menu > a:focus,
-#help-button > a:hover, #help-button > a:focus,
-#sidebar-button > a:hover, #sidebar-button > a:focus {
+#settings-menu > a:hover, #settings-menu > a:focus-visible,
+#help-button > a:hover, #help-button > a:focus-visible,
+#sidebar-button > a:hover, #sidebar-button > a:focus-visible,
+button#toggle-all-docs:hover, button#toggle-all-docs:focus-visible {
 	border-color: var(--settings-button-border-focus);
+	text-decoration: none;
 }
 
-#settings-menu > a {
-	line-height: 0;
-	font-size: 0;
-}
 #settings-menu > a:before {
 	/* Wheel <https://www.svgrepo.com/svg/384069/settings-cog-gear> */
-	content: url('data:image/svg+xml,<svg width="22" height="22" viewBox="0 0 12 12" \
+	content: url('data:image/svg+xml,<svg width="18" height="18" viewBox="0 0 12 12" \
 	enable-background="new 0 0 12 12" xmlns="http://www.w3.org/2000/svg">\
 	<path d="M10.25,6c0-0.1243286-0.0261841-0.241333-0.0366211-0.362915l1.6077881-1.5545654l\
 	-1.25-2.1650391  c0,0-1.2674561,0.3625488-2.1323853,0.6099854c-0.2034912-0.1431885-0.421875\
@@ -1824,16 +1885,70 @@ a.tooltip:hover::after {
 	-0.3701782l2.1323853,0.6099854l1.25-2.1650391L10.2133789,6.362915  C10.2238159,6.241333,\
 	10.25,6.1243286,10.25,6z M6,7.5C5.1715698,7.5,4.5,6.8284302,4.5,6S5.1715698,4.5,6,4.5S7.5\
 	,5.1715698,7.5,6  S6.8284302,7.5,6,7.5z" fill="black"/></svg>');
-	width: 22px;
-	height: 22px;
+	width: 18px;
+	height: 18px;
+	filter: var(--settings-menu-filter);
+}
+
+button#toggle-all-docs:before {
+	/* Custom arrow icon */
+	content: url('data:image/svg+xml,<svg width="18" height="18" viewBox="0 0 12 12" \
+	enable-background="new 0 0 12 12" xmlns="http://www.w3.org/2000/svg">\
+	<path d="M2,2l4,4l4,-4M2,6l4,4l4,-4" stroke="black" fill="none" stroke-width="2px"/></svg>');
+	width: 18px;
+	height: 18px;
+	filter: var(--settings-menu-filter);
+}
+
+#help-button > a:before {
+	/* Question mark with circle */
+	content: url('data:image/svg+xml,<svg width="18" height="18" viewBox="0 0 12 12" \
+	enable-background="new 0 0 12 12" xmlns="http://www.w3.org/2000/svg" fill="none">\
+	<circle r="5.25" cx="6" cy="6" stroke-width="1.25" stroke="black"/>\
+	<text x="6" y="7" style="font:8px sans-serif;font-weight:1000" text-anchor="middle" \
+		dominant-baseline="middle" fill="black">?</text></svg>');
+	width: 18px;
+	height: 18px;
+	filter: var(--settings-menu-filter);
+}
+
+button#toggle-all-docs:before,
+#help-button > a:before,
+#settings-menu > a:before {
 	filter: var(--settings-menu-filter);
+	margin: 8px;
+}
+
+@media not (pointer: coarse) {
+	button#toggle-all-docs:hover:before,
+	#help-button > a:hover:before,
+	#settings-menu > a:hover:before {
+		filter: var(--settings-menu-hover-filter);
+	}
+}
+
+button[disabled]#toggle-all-docs {
+	opacity: 0.25;
+	border: solid 1px var(--main-background-color);
+	background-size: cover;
+}
+
+button[disabled]#toggle-all-docs:hover {
+	border: solid 1px var(--main-background-color);
+	cursor: not-allowed;
+}
+
+rustdoc-toolbar span.label {
+	font-size: 1rem;
+	flex-grow: 1;
+	padding-bottom: 4px;
 }
 
 #sidebar-button > a:before {
 	/* sidebar resizer image */
 	content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 22 22" \
 		fill="none" stroke="black">\
-		<rect x="1" y="1" width="20" height="20" ry="1.5" stroke-width="1.5"/>\
+		<rect x="1" y="1" width="20" height="20" ry="1.5" stroke-width="1.5" stroke="%23777"/>\
 		<circle cx="4.375" cy="4.375" r="1" stroke-width=".75"/>\
 		<path d="m7.6121 3v16 M5.375 7.625h-2 m2 3h-2 m2 3h-2" stroke-width="1.25"/></svg>');
 	width: 22px;
@@ -1948,10 +2063,10 @@ details.toggle > summary.hideme > span {
 }
 
 details.toggle > summary::before {
-	/* toggle plus */
-	background: url('data:image/svg+xml,<svg width="17" height="17" \
-shape-rendering="crispEdges" stroke="black" fill="none" xmlns="http://www.w3.org/2000/svg"><path \
-d="M5 2.5H2.5v12H5m7-12h2.5v12H12M5 8.5h7M8.5 12V8.625v0V5"/></svg>') no-repeat top left;
+	/* arrow pointing left */
+	background: url('data:image/svg+xml,<svg width="16" height="16" viewBox="0 0 12 12" \
+	enable-background="new 0 0 12 12" xmlns="http://www.w3.org/2000/svg">\
+	<path d="M4,2l4,4l-4,4" stroke="black" fill="none" stroke-width="1px"/></svg>');
 	content: "";
 	cursor: pointer;
 	width: 16px;
@@ -2034,10 +2149,10 @@ details.toggle[open] > summary.hideme > span {
 }
 
 details.toggle[open] > summary::before {
-	/* toggle minus */
-	background: url('data:image/svg+xml,<svg width="17" height="17" \
-shape-rendering="crispEdges" stroke="black" fill="none" xmlns="http://www.w3.org/2000/svg"><path \
-d="M5 2.5H2.5v12H5m7-12h2.5v12H12M5 8.5h7"/></svg>') no-repeat top left;
+	/* arrow pointing down */
+	background: url('data:image/svg+xml,<svg width="16" height="16" viewBox="0 0 12 12" \
+	enable-background="new 0 0 12 12" xmlns="http://www.w3.org/2000/svg">\
+	<path d="M2,4l4,4l4,-4" stroke="black" fill="none" stroke-width="1px"/></svg>');
 }
 
 details.toggle[open] > summary::after {
@@ -2090,6 +2205,12 @@ However, it's not needed with smaller screen width because the doc/code block is
 	#search-tabs .count {
 		display: block;
 	}
+	.side-by-side {
+		flex-direction: column-reverse;
+	}
+	.side-by-side > div {
+		width: auto;
+	}
 }
 
 /*
@@ -2106,6 +2227,25 @@ in src-script.js and main.js
 		scroll-margin-top: 45px;
 	}
 
+	/* We don't display this button on mobile devices. */
+	#copy-path {
+		display: none;
+	}
+
+	/* Text label takes up too much space at this size. */
+	rustdoc-toolbar span.label {
+		display: none;
+	}
+	#settings-menu > a, #help-button > a, button#toggle-all-docs {
+		width: 33px;
+	}
+	#settings.popover {
+		--popover-arrow-offset: 86px;
+	}
+	#help.popover {
+		--popover-arrow-offset: 48px;
+	}
+
 	.rustdoc {
 		/* Sidebar should overlay main content, rather than pushing main content to the right.
 		   Turn off `display: flex` on the body element. */
@@ -2117,20 +2257,6 @@ in src-script.js and main.js
 		padding-top: 0px;
 	}
 
-	.main-heading {
-		flex-direction: column;
-	}
-
-	.out-of-band {
-		text-align: left;
-		margin-left: initial;
-		padding: initial;
-	}
-
-	.out-of-band .since::before {
-		content: "Since ";
-	}
-
 	/* Hide the logo and item name from the sidebar. Those are displayed
 	   in the mobile-topbar instead. */
 	.sidebar .logo-container,
@@ -2163,6 +2289,9 @@ in src-script.js and main.js
 	.src .search-form {
 		margin-left: 40px;
 	}
+	.src .main-heading {
+		margin-left: 8px;
+	}
 	.hide-sidebar .search-form {
 		margin-left: 32px;
 	}
@@ -2234,16 +2363,11 @@ in src-script.js and main.js
 		left: -11px;
 	}
 
-	/* We don't display these buttons on mobile devices. */
-	#copy-path, #help-button {
-		display: none;
-	}
-
 	/* sidebar button becomes topbar button */
 	#sidebar-button > a:before {
 		content: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" \
 			viewBox="0 0 22 22" fill="none" stroke="black">\
-			<rect x="1" y="1" width="20" height="20" ry="1.5" stroke-width="1.5"/>\
+			<rect x="1" y="1" width="20" height="20" ry="1.5" stroke-width="1.5" stroke="%23777"/>\
 			<circle cx="4.375" cy="4.375" r="1" stroke-width=".75"/>\
 			<path d="m3 7.375h16m0-3h-4" stroke-width="1.25"/></svg>');
 		width: 22px;
@@ -2305,7 +2429,7 @@ in src-script.js and main.js
 	}
 
 	.src nav.sub {
-		margin: 0;
+		margin: 0 0 -25px 0;
 		padding: var(--nav-sub-mobile-padding);
 	}
 }
@@ -2543,6 +2667,8 @@ by default.
 	--copy-path-img-hover-filter: invert(35%);
 	--code-example-button-color: #7f7f7f;
 	--code-example-button-hover-color: #595959;
+	--settings-menu-filter: invert(50%);
+	--settings-menu-hover-filter: invert(35%);
 	--codeblock-error-hover-color: rgb(255, 0, 0);
 	--codeblock-error-color: rgba(255, 0, 0, .5);
 	--codeblock-ignore-hover-color: rgb(255, 142, 0);
@@ -2569,7 +2695,6 @@ by default.
 	--search-tab-button-not-selected-background: #e6e6e6;
 	--search-tab-button-selected-border-top-color: #0089ff;
 	--search-tab-button-selected-background: #fff;
-	--settings-menu-filter: none;
 	--stab-background-color: #fff5d6;
 	--stab-code-color: #000;
 	--code-highlight-kw-color: #8959a8;
@@ -2673,7 +2798,8 @@ by default.
 	--search-tab-button-not-selected-background: #252525;
 	--search-tab-button-selected-border-top-color: #0089ff;
 	--search-tab-button-selected-background: #353535;
-	--settings-menu-filter: none;
+	--settings-menu-filter: invert(50%);
+	--settings-menu-hover-filter: invert(65%);
 	--stab-background-color: #314559;
 	--stab-code-color: #e6e1cf;
 	--code-highlight-kw-color: #ab8ac1;
@@ -2784,7 +2910,8 @@ Original by Dempfi (https://github.com/dempfi/ayu)
 	--search-tab-button-not-selected-background: transparent !important;
 	--search-tab-button-selected-border-top-color: none;
 	--search-tab-button-selected-background: #141920 !important;
-	--settings-menu-filter: invert(100%);
+	--settings-menu-filter: invert(70%);
+	--settings-menu-hover-filter: invert(100%);
 	--stab-background-color: #314559;
 	--stab-code-color: #e6e1cf;
 	--code-highlight-kw-color: #ff7733;
diff --git a/src/librustdoc/html/static/js/main.js b/src/librustdoc/html/static/js/main.js
index 0eba80133df..0d556e0a682 100644
--- a/src/librustdoc/html/static/js/main.js
+++ b/src/librustdoc/html/static/js/main.js
@@ -1,6 +1,6 @@
 // Local js definitions:
 /* global addClass, getSettingValue, hasClass, searchState, updateLocalStorage */
-/* global onEach, onEachLazy, removeClass, getVar */
+/* global onEachLazy, removeClass, getVar */
 
 "use strict";
 
@@ -19,17 +19,25 @@ function resourcePath(basename, extension) {
 
 function hideMain() {
     addClass(document.getElementById(MAIN_ID), "hidden");
+    const toggle = document.getElementById("toggle-all-docs");
+    if (toggle) {
+        toggle.setAttribute("disabled", "disabled");
+    }
 }
 
 function showMain() {
-    removeClass(document.getElementById(MAIN_ID), "hidden");
-}
-
-function blurHandler(event, parentElem, hideCallback) {
-    if (!parentElem.contains(document.activeElement) &&
-        !parentElem.contains(event.relatedTarget)
-    ) {
-        hideCallback();
+    const main = document.getElementById(MAIN_ID);
+    removeClass(main, "hidden");
+    const mainHeading = main.querySelector(".main-heading");
+    if (mainHeading && searchState.rustdocToolbar) {
+        if (searchState.rustdocToolbar.parentElement) {
+            searchState.rustdocToolbar.parentElement.removeChild(searchState.rustdocToolbar);
+        }
+        mainHeading.appendChild(searchState.rustdocToolbar);
+    }
+    const toggle = document.getElementById("toggle-all-docs");
+    if (toggle) {
+        toggle.removeAttribute("disabled");
     }
 }
 
@@ -167,6 +175,14 @@ function switchDisplayedElement(elemToDisplay) {
     el.appendChild(elemToDisplay);
     hideMain();
     removeClass(el, "hidden");
+
+    const mainHeading = elemToDisplay.querySelector(".main-heading");
+    if (mainHeading && searchState.rustdocToolbar) {
+        if (searchState.rustdocToolbar.parentElement) {
+            searchState.rustdocToolbar.parentElement.removeChild(searchState.rustdocToolbar);
+        }
+        mainHeading.appendChild(searchState.rustdocToolbar);
+    }
 }
 
 function browserSupportsHistoryApi() {
@@ -194,33 +210,36 @@ function preLoadCss(cssUrl) {
         document.head.append(script);
     }
 
-    getSettingsButton().onclick = event => {
-        if (event.ctrlKey || event.altKey || event.metaKey) {
-            return;
-        }
-        window.hideAllModals(false);
-        addClass(getSettingsButton(), "rotate");
-        event.preventDefault();
-        // Sending request for the CSS and the JS files at the same time so it will
-        // hopefully be loaded when the JS will generate the settings content.
-        loadScript(getVar("static-root-path") + getVar("settings-js"));
-        // Pre-load all theme CSS files, so that switching feels seamless.
-        //
-        // When loading settings.html as a standalone page, the equivalent HTML is
-        // generated in context.rs.
-        setTimeout(() => {
-            const themes = getVar("themes").split(",");
-            for (const theme of themes) {
-                // if there are no themes, do nothing
-                // "".split(",") == [""]
-                if (theme !== "") {
-                    preLoadCss(getVar("root-path") + theme + ".css");
-                }
+    if (getSettingsButton()) {
+        getSettingsButton().onclick = event => {
+            if (event.ctrlKey || event.altKey || event.metaKey) {
+                return;
             }
-        }, 0);
-    };
+            window.hideAllModals(false);
+            addClass(getSettingsButton(), "rotate");
+            event.preventDefault();
+            // Sending request for the CSS and the JS files at the same time so it will
+            // hopefully be loaded when the JS will generate the settings content.
+            loadScript(getVar("static-root-path") + getVar("settings-js"));
+            // Pre-load all theme CSS files, so that switching feels seamless.
+            //
+            // When loading settings.html as a standalone page, the equivalent HTML is
+            // generated in context.rs.
+            setTimeout(() => {
+                const themes = getVar("themes").split(",");
+                for (const theme of themes) {
+                    // if there are no themes, do nothing
+                    // "".split(",") == [""]
+                    if (theme !== "") {
+                        preLoadCss(getVar("root-path") + theme + ".css");
+                    }
+                }
+            }, 0);
+        };
+    }
 
     window.searchState = {
+        rustdocToolbar: document.querySelector("rustdoc-toolbar"),
         loadingText: "Loading search results...",
         input: document.getElementsByClassName("search-input")[0],
         outputElement: () => {
@@ -919,8 +938,7 @@ function preLoadCss(cssUrl) {
                 e.open = true;
             }
         });
-        innerToggle.title = "collapse all docs";
-        innerToggle.children[0].innerText = "\u2212"; // "\u2212" is "−" minus sign
+        innerToggle.children[0].innerText = "Summary";
     }
 
     function collapseAllDocs() {
@@ -934,8 +952,7 @@ function preLoadCss(cssUrl) {
                 e.open = false;
             }
         });
-        innerToggle.title = "expand all docs";
-        innerToggle.children[0].innerText = "+";
+        innerToggle.children[0].innerText = "Show all";
     }
 
     function toggleAllDocs() {
@@ -1330,7 +1347,13 @@ function preLoadCss(cssUrl) {
     }
 
     function helpBlurHandler(event) {
-        blurHandler(event, getHelpButton(), window.hidePopoverMenus);
+        if (!getHelpButton().contains(document.activeElement) &&
+            !getHelpButton().contains(event.relatedTarget) &&
+            !getSettingsButton().contains(document.activeElement) &&
+            !getSettingsButton().contains(event.relatedTarget)
+        ) {
+            window.hidePopoverMenus();
+        }
     }
 
     function buildHelpMenu() {
@@ -1433,9 +1456,13 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
      * Hide all the popover menus.
      */
     window.hidePopoverMenus = () => {
-        onEachLazy(document.querySelectorAll(".search-form .popover"), elem => {
+        onEachLazy(document.querySelectorAll("rustdoc-toolbar .popover"), elem => {
             elem.style.display = "none";
         });
+        const button = getHelpButton();
+        if (button) {
+            removeClass(button, "help-open");
+        }
     };
 
     /**
@@ -1460,7 +1487,9 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
     function showHelp() {
         // Prevent `blur` events from being dispatched as a result of closing
         // other modals.
-        getHelpButton().querySelector("a").focus();
+        const button = getHelpButton();
+        addClass(button, "help-open");
+        button.querySelector("a").focus();
         const menu = getHelpMenu(true);
         if (menu.style.display === "none") {
             window.hideAllModals();
@@ -1468,28 +1497,15 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
         }
     }
 
+    const helpLink = document.querySelector(`#${HELP_BUTTON_ID} > a`);
     if (isHelpPage) {
-        showHelp();
-        document.querySelector(`#${HELP_BUTTON_ID} > a`).addEventListener("click", event => {
-            // Already on the help page, make help button a no-op.
-            const target = event.target;
-            if (target.tagName !== "A" ||
-                target.parentElement.id !== HELP_BUTTON_ID ||
-                event.ctrlKey ||
-                event.altKey ||
-                event.metaKey) {
-                return;
-            }
-            event.preventDefault();
-        });
-    } else {
-        document.querySelector(`#${HELP_BUTTON_ID} > a`).addEventListener("click", event => {
+        buildHelpMenu();
+    } else if (helpLink) {
+        helpLink.addEventListener("click", event => {
             // By default, have help button open docs in a popover.
             // If user clicks with a moderator, though, use default browser behavior,
             // probably opening in a new window or tab.
-            const target = event.target;
-            if (target.tagName !== "A" ||
-                target.parentElement.id !== HELP_BUTTON_ID ||
+            if (!helpLink.contains(helpLink) ||
                 event.ctrlKey ||
                 event.altKey ||
                 event.metaKey) {
@@ -1812,14 +1828,11 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
         return;
     }
     but.onclick = () => {
-        const parent = but.parentElement;
         const path = [];
-
-        onEach(parent.childNodes, child => {
-            if (child.tagName === "A") {
-                path.push(child.textContent);
-            }
+        onEachLazy(document.querySelectorAll(".rustdoc-breadcrumbs a"), a => {
+            path.push(a.textContent);
         });
+        path.push(document.querySelector("title").textContent.split(" ")[0]);
 
         copyContentToClipboard(path.join("::"));
         copyButtonAnimation(but);
diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index 4da0bbc787d..eed64d024c0 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -3597,15 +3597,16 @@ async function showResults(results, go_to_first, filterCrates) {
 
     let crates = "";
     if (rawSearchIndex.size > 1) {
-        crates = " in&nbsp;<div id=\"crate-search-div\"><select id=\"crate-search\">" +
-            "<option value=\"all crates\">all crates</option>";
+        crates = "<div class=\"sub-heading\"> in&nbsp;<div id=\"crate-search-div\">" +
+            "<select id=\"crate-search\"><option value=\"all crates\">all crates</option>";
         for (const c of rawSearchIndex.keys()) {
             crates += `<option value="${c}" ${c === filterCrates && "selected"}>${c}</option>`;
         }
-        crates += "</select></div>";
+        crates += "</select></div></div>";
     }
 
-    let output = `<h1 class="search-results-title">Results${crates}</h1>`;
+    let output = `<div class="main-heading">\
+        <h1 class="search-results-title">Results</h1>${crates}</div>`;
     if (results.query.error !== null) {
         const error = results.query.error;
         error.forEach((value, index) => {
@@ -3662,6 +3663,9 @@ async function showResults(results, go_to_first, filterCrates) {
     resultsElem.appendChild(ret_returned[0]);
 
     search.innerHTML = output;
+    if (searchState.rustdocToolbar) {
+        search.querySelector(".main-heading").appendChild(searchState.rustdocToolbar);
+    }
     const crateSearch = document.getElementById("crate-search");
     if (crateSearch) {
         crateSearch.addEventListener("input", updateCrate);
diff --git a/src/librustdoc/html/static/js/settings.js b/src/librustdoc/html/static/js/settings.js
index c52a19ef987..183663b94fc 100644
--- a/src/librustdoc/html/static/js/settings.js
+++ b/src/librustdoc/html/static/js/settings.js
@@ -1,7 +1,7 @@
 // Local js definitions:
 /* global getSettingValue, updateLocalStorage, updateTheme */
-/* global addClass, removeClass, onEach, onEachLazy, blurHandler */
-/* global MAIN_ID, getVar, getSettingsButton */
+/* global addClass, removeClass, onEach, onEachLazy */
+/* global MAIN_ID, getVar, getSettingsButton, getHelpButton */
 
 "use strict";
 
@@ -267,15 +267,16 @@
     }
 
     function settingsBlurHandler(event) {
-        blurHandler(event, getSettingsButton(), window.hidePopoverMenus);
+        if (!getHelpButton().contains(document.activeElement) &&
+            !getHelpButton().contains(event.relatedTarget) &&
+            !getSettingsButton().contains(document.activeElement) &&
+            !getSettingsButton().contains(event.relatedTarget)
+        ) {
+            window.hidePopoverMenus();
+        }
     }
 
-    if (isSettingsPage) {
-        // We replace the existing "onclick" callback to do nothing if clicked.
-        getSettingsButton().onclick = event => {
-            event.preventDefault();
-        };
-    } else {
+    if (!isSettingsPage) {
         // We replace the existing "onclick" callback.
         const settingsButton = getSettingsButton();
         const settingsMenu = document.getElementById("settings");
diff --git a/src/librustdoc/html/static/js/storage.js b/src/librustdoc/html/static/js/storage.js
index d75fb7a7fb5..d77804d045e 100644
--- a/src/librustdoc/html/static/js/storage.js
+++ b/src/librustdoc/html/static/js/storage.js
@@ -274,16 +274,29 @@ class RustdocSearchElement extends HTMLElement {
                     spellcheck="false"
                     placeholder="Type ‘S’ or ‘/’ to search, ‘?’ for more options…"
                     type="search">
-                <div id="help-button" tabindex="-1">
-                    <a href="${rootPath}help.html" title="help">?</a>
-                </div>
-                <div id="settings-menu" tabindex="-1">
-                    <a href="${rootPath}settings.html" title="settings">
-                        Settings
-                    </a>
-                </div>
             </form>
         </nav>`;
     }
 }
 window.customElements.define("rustdoc-search", RustdocSearchElement);
+class RustdocToolbarElement extends HTMLElement {
+    constructor() {
+        super();
+    }
+    connectedCallback() {
+        // Avoid replacing the children after they're already here.
+        if (this.firstElementChild) {
+            return;
+        }
+        const rootPath = getVar("root-path");
+        this.innerHTML = `
+        <div id="settings-menu" tabindex="-1">
+            <a href="${rootPath}settings.html"><span class="label">Settings</span></a>
+        </div>
+        <div id="help-button" tabindex="-1">
+            <a href="${rootPath}help.html"><span class="label">Help</span></a>
+        </div>
+        <button id="toggle-all-docs"><span class="label">Summary</span></button>`;
+    }
+}
+window.customElements.define("rustdoc-toolbar", RustdocToolbarElement);
diff --git a/src/librustdoc/html/templates/print_item.html b/src/librustdoc/html/templates/print_item.html
index 76e770453b6..32ded1fbe42 100644
--- a/src/librustdoc/html/templates/print_item.html
+++ b/src/librustdoc/html/templates/print_item.html
@@ -1,26 +1,33 @@
 <div class="main-heading"> {# #}
+    {% if !path_components.is_empty() %}
+    <span class="rustdoc-breadcrumbs">
+        {% for (i, component) in path_components.iter().enumerate() %}
+            {% if i != 0 %}
+                ::<wbr>
+            {% endif %}
+            <a href="{{component.path|safe}}index.html">{{component.name}}</a>
+        {% endfor %}
+    </span>
+    {% endif %}
     <h1>
         {{typ}}
-        {# The breadcrumbs of the item path, like std::string #}
-        {% for component in path_components %}
-            <a href="{{component.path|safe}}index.html">{{component.name}}</a>::<wbr>
-        {% endfor %}
-        <a class="{{item_type}}" href="#">{{name}}</a> {# #}
+        <span{% if item_type != "mod" +%} class="{{item_type}}"{% endif %}>
+        {{name}}
+        </span> {# #}
         <button id="copy-path" title="Copy item path to clipboard"> {# #}
             Copy item path {# #}
         </button> {# #}
     </h1> {# #}
-    <span class="out-of-band">
+    <rustdoc-toolbar></rustdoc-toolbar> {# #}
+    <span class="sub-heading">
         {% if !stability_since_raw.is_empty() %}
-        {{ stability_since_raw|safe +}} · {#+ #}
+        {{ stability_since_raw|safe +}}
         {% endif %}
         {% match src_href %}
             {% when Some with (href) %}
-                <a class="src" href="{{href|safe}}">source</a> · {#+ #}
+                {% if !stability_since_raw.is_empty() +%} · {%+ endif %}
+                <a class="src" href="{{href|safe}}">source</a> {#+ #}
             {% else %}
         {% endmatch %}
-        <button id="toggle-all-docs" title="collapse all docs"> {# #}
-            [<span>&#x2212;</span>] {# #}
-        </button> {# #}
     </span> {# #}
 </div> {# #}
diff --git a/src/librustdoc/html/templates/source.html b/src/librustdoc/html/templates/source.html
index 60a47f1b5de..9daa0cf8ff6 100644
--- a/src/librustdoc/html/templates/source.html
+++ b/src/librustdoc/html/templates/source.html
@@ -1,4 +1,15 @@
-<div class="example-wrap">
+{% match file_path %}
+{% when Some with ((path, name)) %}
+<div class="main-heading"> {# #}
+    <h1> {# #}
+        <div class="sub-heading">{{path}}/</div>
+        {{name}}
+    </h1> {# #}
+    <rustdoc-toolbar></rustdoc-toolbar> {# #}
+</div>
+{% else %}
+{% endmatch %}
+<div class="example-wrap"> {# #}
     {# https://developers.google.com/search/docs/crawling-indexing/robots-meta-tag#data-nosnippet-attr
        Do not show "1 2 3 4 5 ..." in web search results. #}
     <div data-nosnippet><pre class="src-line-numbers">