I have one custom button "Resolve Case" on the case entity ribbon form. On click of resolve case button I have mapped javascript method.

This javascript method is using 

showModalDialog

to open an HTML web resource.

This code is working in Internet explore.

But this code is not working in Chrome Version 48.0.2564.116 m

How to make this work in chrome?

or some alternative for 

showModalDialog

in ms crm 2016?