If you're reading this, it means that you're using an outdated browser, most likely Internet Explorer. If you're not using it for a specific reason, you should probably switch to a modern browser. Using an up-to-date browser allows modern web features to be used properly used and saves web developers a lot of work.
This website supports all relatively up-to-date Blink Chromium (Chrome, Edge, Brave, Opera, etc.,) Webkit (Chrome*, Safari,) and Gecko (Firefox) browsers. Partial support for Internet Explorer also exist, although it is far from perfect.