Merge "Add font size feature flag"

includes/Constants.php

@@ -250,6 +250,21 @@ final class Constants {
 	 */
 	public const REQUIREMENT_ZEBRA_AB_TEST = 'VectorZebraDesign';
 
+	/**
+	 * @var string
+	 */
+	public const CONFIG_KEY_FONT_SIZE = 'VectorCustomFontSize';
+
+	/**
+	 * @var string
+	 */
+	public const FEATURE_FONT_SIZE = 'CustomFontSize';
+
+	/**
+	 * @var string
+	 */
+	public const REQUIREMENT_FONT_SIZE = 'CustomFontSize';
+
 	/**
 	 * This class is for namespacing constants only. Forbid construction.
 	 * @throws FatalError

includes/ServiceWiring.php

@@ -277,6 +277,26 @@ return [
 			]
 		);
 
+		// Feature: T343928: Feature Font Size.
+		// ================================
+		$featureManager->registerRequirement(
+			new OverridableConfigRequirement(
+				$services->getMainConfig(),
+				$context->getUser(),
+				$context->getRequest(),
+				Constants::CONFIG_KEY_FONT_SIZE,
+				Constants::REQUIREMENT_FONT_SIZE
+			)
+		);
+
+		// Register 'custom-font-size' as the default requirement
+		$featureManager->registerFeature(
+			Constants::FEATURE_FONT_SIZE,
+			[
+				Constants::REQUIREMENT_FULLY_INITIALISED,
+				Constants::REQUIREMENT_FONT_SIZE
+			]
+		);
 		return $featureManager;
 	}
 ];

resources/common/typography.less

@@ -89,6 +89,10 @@ pre,
 	font-size: @font-size-base--trident-hack;
 	line-height: @line-height-base;
 
+	.vector-feature-custom-font-size-enabled & {
+		font-size: 16px;
+	}
+
 	#siteSub {
 		font-size: 12.8px; // T311421
 	}

skin.json

@@ -600,6 +600,13 @@
 				"logged_out": false
 			},
 			"description": "@var boolean Temporary feature flag that enables the zebra design for the Vector skin."
+		},
+		"VectorCustomFontSize": {
+			"value": {
+				"logged_in": false,
+				"logged_out": false
+			},
+			"description": "@var boolean feature flag that enables customizing the Vector font-size."
 		}
 	},
 	"ServiceWiringFiles": [