Move tooltips messages to CSS instead of inside HTML

src/librustdoc/html/highlight.rs

@@ -11,6 +11,7 @@ use std::fmt::{Display, Write};
 use std::iter::Peekable;
 
 use rustc_lexer::{LiteralKind, TokenKind};
+use rustc_span::edition::Edition;
 use rustc_span::symbol::Ident;
 use rustc_span::with_default_session_globals;
 
@@ -19,16 +20,20 @@ crate fn render_with_highlighting(
     src: String,
     class: Option<&str>,
     playground_button: Option<&str>,
-    tooltip: Option<(&str, &str)>,
+    tooltip: Option<(Option<Edition>, &str)>,
 ) -> String {
     debug!("highlighting: ================\n{}\n==============", src);
     let mut out = String::with_capacity(src.len());
-    if let Some((tooltip, class)) = tooltip {
+    if let Some((edition_info, class)) = tooltip {
         write!(
             out,
-            "<div class='information'><div class='tooltip {}'>ⓘ<span \
-                  class='tooltiptext'>{}</span></div></div>",
-            class, tooltip
+            "<div class='information'><div class='tooltip {}'{}>ⓘ</div></div>",
+            class,
+            if let Some(edition_info) = edition_info {
+                format!(" edition=\"{}\"", edition_info)
+            } else {
+                String::new()
+            },
         )
         .unwrap();
     }

src/librustdoc/html/markdown.rs

@@ -286,60 +286,27 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for CodeBlocks<'_, 'a, I> {
         });
 
         let tooltip = if ignore != Ignore::None {
-            Some(("This example is not tested".to_owned(), "ignore"))
+            Some((None, "ignore"))
         } else if compile_fail {
-            Some(("This example deliberately fails to compile".to_owned(), "compile_fail"))
+            Some((None, "compile_fail"))
         } else if should_panic {
-            Some(("This example panics".to_owned(), "should_panic"))
+            Some((None, "should_panic"))
         } else if explicit_edition {
-            Some((format!("This code runs with edition {}", edition), "edition"))
+            Some((Some(edition), "edition"))
         } else {
             None
         };
 
-        if let Some((s1, s2)) = tooltip {
-            s.push_str(&highlight::render_with_highlighting(
-                text,
-                Some(&format!(
-                    "rust-example-rendered{}",
-                    if ignore != Ignore::None {
-                        " ignore"
-                    } else if compile_fail {
-                        " compile_fail"
-                    } else if should_panic {
-                        " should_panic"
-                    } else if explicit_edition {
-                        " edition "
-                    } else {
-                        ""
-                    }
-                )),
-                playground_button.as_deref(),
-                Some((s1.as_str(), s2)),
-            ));
-            Some(Event::Html(s.into()))
-        } else {
-            s.push_str(&highlight::render_with_highlighting(
-                text,
-                Some(&format!(
-                    "rust-example-rendered{}",
-                    if ignore != Ignore::None {
-                        " ignore"
-                    } else if compile_fail {
-                        " compile_fail"
-                    } else if should_panic {
-                        " should_panic"
-                    } else if explicit_edition {
-                        " edition "
-                    } else {
-                        ""
-                    }
-                )),
-                playground_button.as_deref(),
-                None,
-            ));
-            Some(Event::Html(s.into()))
-        }
+        s.push_str(&highlight::render_with_highlighting(
+            text,
+            Some(&format!(
+                "rust-example-rendered{}",
+                if let Some((_, class)) = tooltip { format!(" {}", class) } else { String::new() }
+            )),
+            playground_button.as_deref(),
+            tooltip,
+        ));
+        Some(Event::Html(s.into()))
     }
 }
 

src/librustdoc/html/static/rustdoc.css

@@ -1079,20 +1079,29 @@ h3 > .collapse-toggle, h4 > .collapse-toggle {
 	cursor: pointer;
 }
 
-.tooltip .tooltiptext {
-	width: 120px;
+.tooltip::after {
 	display: none;
 	text-align: center;
 	padding: 5px 3px 3px 3px;
 	border-radius: 6px;
 	margin-left: 5px;
-	top: -5px;
-	left: 105%;
-	z-index: 10;
 	font-size: 16px;
 }
 
-.tooltip .tooltiptext::after {
+.tooltip.ignore::after {
+	content: "This example is not tested";
+}
+.tooltip.compile_fail::after {
+	content: "This example deliberately fails to compile";
+}
+.tooltip.should_panic::after {
+	content: "This example panics";
+}
+.tooltip.edition::after {
+	content: "This code runs with edition " attr(edition);
+}
+
+.tooltip::before {
 	content: " ";
 	position: absolute;
 	top: 50%;
@@ -1100,9 +1109,10 @@ h3 > .collapse-toggle, h4 > .collapse-toggle {
 	margin-top: -5px;
 	border-width: 5px;
 	border-style: solid;
+	display: none;
 }
 
-.tooltip:hover .tooltiptext {
+.tooltip:hover::before, .tooltip:hover::after {
 	display: inline;
 }
 

src/librustdoc/html/static/themes/ayu.css

@@ -388,13 +388,13 @@ pre.ignore:hover, .information:hover + pre.ignore {
 	color: #39AFD7;
 }
 
-.tooltip .tooltiptext {
+.tooltip::after {
 	background-color: #314559;
 	color: #c5c5c5;
 	border: 1px solid #5c6773;
 }
 
-.tooltip .tooltiptext::after {
+.tooltip::before {
 	border-color: transparent #314559 transparent transparent;
 }
 

src/librustdoc/html/static/themes/dark.css

@@ -337,13 +337,13 @@ pre.ignore:hover, .information:hover + pre.ignore {
 	color: #0089ff;
 }
 
-.tooltip .tooltiptext {
+.tooltip::after {
 	background-color: #000;
 	color: #fff;
 	border-color: #000;
 }
 
-.tooltip .tooltiptext::after {
+.tooltip::before {
 	border-color: transparent black transparent transparent;
 }
 

src/librustdoc/html/static/themes/light.css

@@ -329,12 +329,12 @@ pre.ignore:hover, .information:hover + pre.ignore {
 	color: #0089ff;
 }
 
-.tooltip .tooltiptext {
+.tooltip::after {
 	background-color: #000;
 	color: #fff;
 }
 
-.tooltip .tooltiptext::after {
+.tooltip::before {
 	border-color: transparent black transparent transparent;
 }