I know this is an old post, with a lot of changes since 2017, but I have found that I can close my current tab/window with the following now in 2019:
onClick="javascript:window.close('','_parent','');"
I know this is an old post, with a lot of changes since 2017, but I have found that I can close my current tab/window with the following now in 2019:
onClick="javascript:window.close('','_parent','');"