New version of Chrome doesn’t showModalDialog method.
As an alternate we can use Xrm.Internal.openDialog method

- And in the HTML Web Resource page
We need to refer ClientGlobalContext.js.aspx

To return value to the parent window and close the current window

Helpful links
https://debajitcrm.wordpress.com/2014/04/29/exploring-the-xrm-internal-namespace-in-crm-2013/
https://dynamicsofdynamicscrm.wordpress.com/2014/04/28/call-crm-2013-modal-window-for-webresources/
https://mscrmmindfire.wordpress.com/2014/04/23/open-dialog-box-like-crm-2013/
MOST IMP – It is unsupported
Hope it helps!!




















