diff --git a/includes/Hooks/StylesheetSanitizerHook.php b/includes/Hooks/StylesheetSanitizerHook.php
index ed2a473..69e346a 100644
--- a/includes/Hooks/StylesheetSanitizerHook.php
+++ b/includes/Hooks/StylesheetSanitizerHook.php
@@ -69,6 +69,7 @@ class StylesheetSanitizerHook {
 		$extended->addAspectRatio( $extender, $matcherFactory );
 		$extended->addInlineBlockMarginPaddingProperties( $extender, $matcherFactory );
 		$extended->addInsetProperties( $extender, $matcherFactory );
+		$extended->addBackdropFilter( $extender );
 
 		$propertySanitizer->setKnownProperties( $extender->getKnownProperties() );
 	}
diff --git a/includes/TemplateStylesExtender.php b/includes/TemplateStylesExtender.php
index 62c65c7..812bece 100644
--- a/includes/TemplateStylesExtender.php
+++ b/includes/TemplateStylesExtender.php
@@ -330,6 +330,23 @@ class TemplateStylesExtender {
 		}
 	}
 
+	/**
+	 * Adds the backdrop-filter matcher
+	 *
+	 * @param StylePropertySanitizer $propertySanitizer
+	 */
+	public function addBackdropFilter( StylePropertySanitizer $propertySanitizer ): void {
+		try {
+			$filter = $propertySanitizer->getKnownProperties()['filter'];
+
+			$propertySanitizer->addKnownProperties( [
+				'backdrop-filter' => Quantifier::plus( $filter ),
+			] );
+		} catch ( InvalidArgumentException $e ) {
+			// Fail silently
+		}
+	}
+
 	/**
 	 * Loads a config value for a given key from the main config
 	 * Returns null on if an ConfigException was thrown