<?php
/*
 * Author	: TechnoKnol
 * Blog		: http://technoknol.blogspot.com
 * Purpose	: Allow HTML tags in Widget Title in WordPress
 * 
 * */
// Add below code in your theme's functions.php file 
// Allow HTML tags in Widget title 
	function html_widget_title( $var) {
		$var = (str_replace( '[', '<', $var ));
		$var = (str_replace( ']', '>', $var ));
		return $var ;
		
	}
	add_filter( 'widget_title', 'html_widget_title' );

// Usage :    Use Forum type BB code styling just replace < & > with [ and ]
// If you wanna give class to tag , Apply without Quote. 
// See Example Below. 

Title with[span class=class_without_quote ]span Tag[/span]