Why doesn't this jquery selector with a period work

Question

I have a div with an ID

this jquery selector works

$(\"[id^=\'updates-pane         


        

Answer 1

$("#updates-pane-user\\.followed_on") - This Should work as per the Jquery documentation

// Does not work
 $("#some:id")

 // Works!
 $("#some\\:id")

 // Does not work
 $("#some.id")

 // Works!
 $("#some\\.id")