Show a message if the browser is not internet explorer 9 or greater

Question

I would like to show my users a bar that looks like this, if:

1. Browser is not IE; or
2. Browser is IE but is version 8 or earlier

Answer 1

Actually in SharePoint (OP mentioned that) there is a built-in variable browseris. It's available in the global window scope. Answering OP question:

1. Browser is not IE;

• use browseris.ie

2. Browser is IE but is version 8 or earlier

• use browseris.ie8down

(tested in SP2013 on-prem)