Hide quick launch for visitors through SPSecurityTrimmedControl permission SharePoint 2013 .
shahzad_samejo@yahoo.com
<div data-name="SecurityTrimmedAdministrators">
<!--CS: Start Security Trim Snippet-->
<!--SPM:<%@Register Tagprefix="SharePoint" Namespace="Microsoft.SharePoint.WebControls" Assembly="Microsoft.SharePoint, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"%>-->
<!--MS:<SharePoint:SPSecurityTrimmedControl runat="server" Permissions="FullMask ">-->
<!--PS: Start of READ-ONLY PREVIEW (do not modify)--><span><!--PE: End of READ-ONLY PREVIEW-->
<h1>your code here which you want to hide for visitors</h1>
<!--PS: Start of READ-ONLY PREVIEW (do not modify)--></span><!--PE: End of READ-ONLY PREVIEW-->
<!--ME:</SharePoint:SPSecurityTrimmedControl>-->
<!--CE: End Security Trim Snippet-->
</div>
shahzad_samejo@yahoo.com