Custom google map in sharepoint online

http://www.c-sharpcorner.com/article/create-interactive-custom-google-map-in-sharepoint-online/

Copy list item from List A to List B with check exist using event reciever

http://sharepoint.stackexchange.com/questions/200608/how-to-check-if-list-item-already-exists-c-sharepoint-2013

Capture browser or browser tab

http://muralisoftshare.blogspot.in/2016/11/capture-browser-or-broswer-tab-is.html?m=1