In one of my previous post, I explained how to use navigateTo() function to navigate to entity view. But with this function, we can do lot more like navigate to dashboards and open modal popups (html web resources) which is most awaiting feature since long back. So, finally we can open a html web resource from a ribbon button click with OOB functions.
Please follow this link to know how to use this.
Thanks Gopinath for sharing this.