rustdoc: add rustdoc top bar web component

Author: notriddle

src/tools/compiletest/src/runtest.rs

@@ -2151,7 +2151,7 @@ impl<'test> TestCx<'test> {
 
         #[rustfmt::skip]
         let tidy_args = [
-            "--new-blocklevel-tags", "rustdoc-search,rustdoc-toolbar",
+            "--new-blocklevel-tags", "rustdoc-search,rustdoc-toolbar,rustdoc-topbar",
             "--indent", "yes",
             "--indent-spaces", "2",
             "--wrap", "0",

src/tools/html-checker/main.rs

@@ -31,7 +31,7 @@ fn check_html_file(file: &Path) -> usize {
         .arg("--mute-id") // this option is useful in case we want to mute more warnings
         .arg("yes")
         .arg("--new-blocklevel-tags")
-        .arg("rustdoc-search,rustdoc-toolbar") // custom elements
+        .arg("rustdoc-search,rustdoc-toolbar,rustdoc-topbar") // custom elements
         .arg("--mute")
         .arg(&to_mute_s)
         .arg(file);