Recently, official support for Internet Explorer ended. Ref this question (status-complete):
Maybe it's time to formally drop support for IE 11
Due to dumb IT policies at work, out of my control, Internet Explorer is the only browser available to me. I'm a regular user of the site, and now I have to see this banner every time I visit, on every page I visit - without being able to close the banner or update my browser!
I understand the move to drop official support, and I understand the need for a banner, but can you please add a close button which hides it for at least the current browser session?
By example, Github has a similar message with a helpful "Ignore" button: