If you’re writing little WebBrowser frames to wrap localhost web applications, you’ll want to read this article so that you control what version of IE you’re using.

TLDR: Add the following Meta tag to your pages to force them to render with the most up to date IE your computer has:

<meta http-equiv="X-UA-Compatible" content="IE=edge" /> 

A lot more detail here:

https://weblog.west-wind.com/posts/2011/May/21/Web-Browser-Control-Specifying-the-IE-Version