How create a shortcode with html

Please use below code

 function html_show($atts) {

   $makearr =  explode(",",$atts['content']);
   if(isset($makearr) && !empty($makearr)) { 
   foreach($makearr as $arrval){
    $stringli .= '<li>'. $arrval.'</li>';
   }
   } else {
   $stringli = '';
   }  
    $htmlcode="<div class="notify"><span class="symbol icon-fact"></span> <strong>A kind of a notice box !</strong><ul>".$stringli.'</ul>
</div>';
    return $htmlcode;
}
add_shortcode( 'htmltag', 'html_show' );


  /*******Using method*******/
echo do_shortcode('[htmltag content="message1,message2,message3,message4"]');