Add language whitespace test

Author: sirreal

tests/phpunit/tests/html-api/wpHtmlTagProcessorScriptTag.php

@@ -102,6 +102,9 @@ public static function data_is_javascript_script_tag(): array {
 			'Script tag with language="jscript"'         => array( '<script language="jscript"></script>', true ),
 			'Script tag with language="livescript"'      => array( '<script language="livescript"></script>', true ),
 
+			// Whitespace is not trimmed in the langauge attribute.
+			'Script tag with language=" javascript"'      => array( '<script language=" javascript"></script>', false ),
+
 			// Non-JavaScript script tags - should NOT be JavaScript.
 			'Script tag with importmap type'             => array( '<script type="importmap"></script>', false ),
 			'Script tag with speculationrules type'      => array( '<script type="speculationrules"></script>', false ),