diff --git a/crates/doc/src/resolve.rs b/crates/doc/src/resolve.rs
--- a/crates/doc/src/resolve.rs
+++ b/crates/doc/src/resolve.rs
@@ -398,13 +398,25 @@ mod tests {
     #[test]
     fn heading_resolves() {
         let s = StyleSheet::builtin();
-        let p = s.resolve_para(&ParaProps { style: Some("Heading1".into()), ..Default::default() });
-        assert!(p.keep_next);
-        assert_eq!(p.outline_level, Some(0));
-        assert_eq!(p.space_after, 4.0);
+        let h1 = s.resolve_para(&ParaProps { style: Some("Heading1".into()), ..Default::default() });
+        assert!(h1.keep_next);
+        assert_eq!(h1.outline_level, Some(0));
+        assert_eq!((h1.space_before, h1.space_after), (12.0, 6.0));
         let c = s.resolve_char(Some("Heading1"), &CharProps::default());
-        assert_eq!(c.size, 20.0);
-        assert_eq!(c.font, crate::styles::HEADING_FONT);
+        assert_eq!(c.size, 24.0);
+        assert_eq!(c.font, crate::styles::HEADING_SERIF_FONT);
+        assert!(c.bold, "the headings are bold");
+        assert_eq!(c.color, TextColor::Rgb(crate::styles::HEADING_BLUE), "heading blue");
+        // Levels 2 and 3: sans and serif faces, sizes and spacing.
+        let h2 = s.resolve_para(&ParaProps { style: Some("Heading2".into()), ..Default::default() });
+        assert_eq!((h2.outline_level, h2.space_before, h2.space_after), (Some(1), 10.0, 6.0));
+        let h2c = s.resolve_char(Some("Heading2"), &CharProps::default());
+        assert_eq!((h2c.size, h2c.font.as_str(), h2c.bold), (16.0, crate::styles::HEADING_SANS_FONT, true));
+        let h3 = s.resolve_para(&ParaProps { style: Some("Heading3".into()), ..Default::default() });
+        assert_eq!((h3.outline_level, h3.space_before, h3.space_after), (Some(2), 7.0, 6.0));
+        let h3c = s.resolve_char(Some("Heading3"), &CharProps::default());
+        assert_eq!((h3c.size, h3c.font.as_str(), h3c.bold), (14.0, crate::styles::HEADING_SERIF_FONT, true));
+        // Direct formatting still wins.
         let c2 = s.resolve_char(Some("Heading1"), &CharProps { size: Some(30.0), ..Default::default() });
         assert_eq!(c2.size, 30.0);
     }
diff --git a/crates/doc/src/styles.rs b/crates/doc/src/styles.rs
--- a/crates/doc/src/styles.rs
+++ b/crates/doc/src/styles.rs
@@ -460,6 +460,10 @@ pub const HEADING_BLUE: Rgb = Rgb(0x0F, 0x47, 0x61);
 /// Default body/heading fonts (theme minor/major). Substituted by layout when not installed.
 pub const BODY_FONT: &str = "Aptos";
 pub const HEADING_FONT: &str = "Aptos Display";
+/// Microsoft serif and sans heading fonts: Heading 1 and Heading 3 are set in Cambria,
+/// Heading 2 in Aptos Display. Both are substituted by layout when not installed.
+pub const HEADING_SERIF_FONT: &str = "Cambria";
+pub const HEADING_SANS_FONT: &str = "Aptos Display";
 
 fn chr() -> CharProps {
     CharProps::default()
@@ -517,18 +521,18 @@ impl StyleSheet {
             quick: true,
             ..p_style()
         });
-        let heads: [(f32, f32, f32, Option<bool>, Rgb, &str); 9] = [
-            (20.0, 18.0, 4.0, None, HEADING_BLUE, HEADING_FONT),
-            (16.0, 8.0, 4.0, None, HEADING_BLUE, HEADING_FONT),
-            (14.0, 8.0, 4.0, None, HEADING_BLUE, BODY_FONT),
-            (12.0, 4.0, 2.0, Some(true), HEADING_BLUE, BODY_FONT),
-            (12.0, 4.0, 2.0, None, HEADING_BLUE, BODY_FONT),
-            (12.0, 2.0, 0.0, Some(true), Rgb(0x59, 0x59, 0x59), BODY_FONT),
-            (12.0, 2.0, 0.0, None, Rgb(0x59, 0x59, 0x59), BODY_FONT),
-            (12.0, 0.0, 0.0, Some(true), Rgb(0x27, 0x27, 0x27), BODY_FONT),
-            (12.0, 0.0, 0.0, None, Rgb(0x27, 0x27, 0x27), BODY_FONT),
+        let heads: [(f32, f32, f32, Option<bool>, Rgb, &str, bool); 9] = [
+            (24.0, 12.0, 6.0, None, HEADING_BLUE, HEADING_SERIF_FONT, true),
+            (16.0, 10.0, 6.0, None, HEADING_BLUE, HEADING_SANS_FONT, true),
+            (14.0, 7.0, 6.0, None, HEADING_BLUE, HEADING_SERIF_FONT, true),
+            (12.0, 4.0, 2.0, Some(true), HEADING_BLUE, BODY_FONT, false),
+            (12.0, 4.0, 2.0, None, HEADING_BLUE, BODY_FONT, false),
+            (12.0, 2.0, 0.0, Some(true), Rgb(0x59, 0x59, 0x59), BODY_FONT, false),
+            (12.0, 2.0, 0.0, None, Rgb(0x59, 0x59, 0x59), BODY_FONT, false),
+            (12.0, 0.0, 0.0, Some(true), Rgb(0x27, 0x27, 0x27), BODY_FONT, false),
+            (12.0, 0.0, 0.0, None, Rgb(0x27, 0x27, 0x27), BODY_FONT, false),
         ];
-        for (i, (size, before, after, italic, c, font)) in heads.into_iter().enumerate() {
+        for (i, (size, before, after, italic, c, font, bold)) in heads.into_iter().enumerate() {
             let n = i + 1;
             add(Style {
                 id: format!("Heading{n}"),
@@ -544,7 +548,7 @@ impl StyleSheet {
                     outline_level: Some(i as u8),
                     ..para()
                 },
-                chr: CharProps { font: Some(font.into()), size: Some(size), italic, color: color(c), ..chr() },
+                chr: CharProps { font: Some(font.into()), size: Some(size), italic, bold: bold.then_some(true), color: color(c), ..chr() },
                 priority: Some(9 + n as u32),
                 quick: n <= 3,
                 ..p_style()