Escape < too for good measure

Author: sirreal

src/wp-includes/fonts/class-wp-font-face.php

@@ -426,6 +426,7 @@ protected function normalize_css_font_family( string $font_family ): string {
 				'\\'   => '\\5C ',
 				','    => '\\2C ',
 				'"'    => '\\22 ',
+				'<'    => '\\3C ',
 			)
 		) . '"';
 	}

tests/phpunit/tests/fonts/font-face/wpFontFace/generateAndPrint.php

@@ -59,7 +59,7 @@ public static function data_font_family_normalization() {
 			'Generic collision'      => array( 'serif', '"serif"' ),
 			'Trims whitespace'       => array( '   A font name    ', '"A font name"' ),
 			'Name with \' character' => array( 'O\'Reilly Sans', '"O\'Reilly Sans"' ),
-			'Unrealistically tricky' => array( "BS\\Quot\"Apos'Semi;Comma,Newline\nLT<Oh😵My!", '"BS\\5C Quot\\22 Apos\'Semi;Comma\\2C Newline\\A LT<Oh😵My!"' ),
+			'Unrealistically tricky' => array( "BS\\Quot\"Apos'Semi;Comma,Newline\nLT<Oh😵My!", '"BS\\5C Quot\\22 Apos\'Semi;Comma\\2C Newline\\A LT\\3C Oh😵My!"' ),
 		);
 	}