Made Customised Certificate with Javascript but it is not show in Google Chrome

Hi Articulate team,

I am a newbie who just using Articulate story 360.

I try to make Customised Certificate file with Javascript the I found that IE, Firefox browsers are running well but it is not show anything on google chrome.

Could you please help me check my javascript code?

<SCRIPT> 

 var player=window.opener.GetPlayer(); 
 
 var learnerName=player.GetVar("learner"); 

 //Content
 document.write('<div class="bgimage"><img src="CertificateBG.gif"/></div>');
 document.write('<div class="result">'+learnerName+', you have passed <b>The Quiz</b>!<br/><br/><em>For that feat, you deserve a break. Take 30 seconds. Then get back to work!</em></div>'); 
 document.write('</div>');

 //Send print request to browser if possible
 window.onload = function() { window.print(); } 
</SCRIPT>

Thank you everyone in advance.

Yupontee.