Sharepoint online Sync button missing issue

https://vigneshsharepointthoughts.com/2017/03/14/sharepoint-online-sync-button-missing-issue-on-project-sites-is-fixed/

Delete Sharepoint Site using RESt

http://www.enjoysharepoint.com/Articles/Details/delete-sharepoint-site-using-rest-api-in-sharepoint-online-office-21863.aspx

Operations using jsom

https://msdn.microsoft.com/en-us/library/office/jj163201.aspx