How to Add Kernel Parameter like HTML Attribute

1. Go to admin/site-map page
   
   
   
   
2. Click on Kernel Link at the bottom of the site-map page.
   
   
   
   
3. Locate the "AllowedAttribute" parameter and add necessary attribute at the end of the input textbox.
   
   
   

   
   Type the additional attribute that you would like to add for e.g "dir".
   

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4. Click OK to save the changes.