[MOOSE-355] FE: Core Heading Block Overline Style

CHANGELOG.md

@@ -5,6 +5,7 @@ on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/). Each changelog entr
 item (Added, Changed, Depreciated, Removed, Fixed, Security).
 
 ## [2026.04]
+
 - Updated: all plugins, composer & npm packages to latest; pin React to v18 as an override to resolve conflicts between ` @dnd-kit/core` and `@wordpress/icons`; pin several other packages to newer versions to resolve security warnings.
 
 ## [2026.03]
@@ -21,8 +22,10 @@ item (Added, Changed, Depreciated, Removed, Fixed, Security).
 - Updated: Update force activation options. Force activate ACF Pro, Disable Emojis, Safe SVG on all envs
 - Fixed: XDebug config for lando
 - Added: XDebug documentation
+- Added: The core Heading block now contains an "Overline" style that's consistent with the style guide.
 
 ## [2026.02]
+
 - Added: `moderntribe/tribe_embed` composer package v1.1.0.
 - Updated: Renamed "Moose" to "ModernPress" across the project (excluding Lando configs and deployment pipelines).
 - Updated: Expected PHP version to v8.4, Node version to v24 LTS

wp-content/themes/core/styles/blocks/heading/70-overline.json

@@ -0,0 +1,15 @@
+{
+	"$schema": "https://schemas.wp.org/trunk/theme.json",
+	"version": 3,
+	"slug": "overline",
+	"title": "Overline",
+	"blockTypes": [ "core/heading" ],
+	"styles": {
+		"typography": {
+			"fontFamily": "var(--wp--preset--font-family--inter)",
+			"fontSize": "var(--wp--preset--font-size--20)",
+			"lineHeight": "1.6",
+			"fontWeight": "var(--wp--custom--font-weight--bold)"
+		}
+	}
+}