Fix documentation header sizes

And add a rustdoc-gui test confirming various header sizes.

2 files changed, 5 insertions, 5 deletions

diff --git a/src/librustdoc/html/render/mod.rs b/src/librustdoc/html/render/mod.rs
index a5e62baca38..0f83346a67a 100644
--- a/src/librustdoc/html/render/mod.rs
+++ b/src/librustdoc/html/render/mod.rs
@@ -1612,7 +1612,7 @@ fn render_impl(
                     error_codes: cx.shared.codes,
                     edition: cx.shared.edition(),
                     playground: &cx.shared.playground,
-                    heading_offset: HeadingOffset::H2
+                    heading_offset: HeadingOffset::H4
                 }
                 .into_string()
             );
diff --git a/src/librustdoc/html/render/print_item.rs b/src/librustdoc/html/render/print_item.rs
index 12ea7b4f74b..f70369d7ab4 100644
--- a/src/librustdoc/html/render/print_item.rs
+++ b/src/librustdoc/html/render/print_item.rs
@@ -983,7 +983,7 @@ fn item_union(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, s: &clean::Uni
             if let Some(stability_class) = field.stability_class(cx.tcx()) {
                 write!(w, "<span class=\"stab {stab}\"></span>", stab = stability_class);
             }
-            document(w, cx, field, Some(it), HeadingOffset::H2);
+            document(w, cx, field, Some(it), HeadingOffset::H3);
         }
     }
     let def_id = it.def_id.expect_def_id();
@@ -1094,7 +1094,7 @@ fn item_enum(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, e: &clean::Enum
             w.write_str("</code>");
             render_stability_since(w, variant, it, cx.tcx());
             w.write_str("</div>");
-            document(w, cx, variant, Some(it), HeadingOffset::H2);
+            document(w, cx, variant, Some(it), HeadingOffset::H3);
             document_non_exhaustive(w, variant);
 
             use crate::clean::Variant;
@@ -1134,7 +1134,7 @@ fn item_enum(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, e: &clean::Enum
                                 f = field.name.as_ref().unwrap(),
                                 t = ty.print(cx)
                             );
-                            document(w, cx, field, Some(variant), HeadingOffset::H2);
+                            document(w, cx, field, Some(variant), HeadingOffset::H4);
                         }
                         _ => unreachable!(),
                     }
@@ -1286,7 +1286,7 @@ fn item_struct(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, s: &clean::St
                     name = field_name,
                     ty = ty.print(cx)
                 );
-                document(w, cx, field, Some(it), HeadingOffset::H2);
+                document(w, cx, field, Some(it), HeadingOffset::H3);
             }
         }
     }