USING C# WITH .NET
In order to answer this question, let's first get a clear picture of what the C# and the .NET Framework entails.
END-TO-END TESTING AND CYPRESS
You might we be wondering, what is end-to-end testing (e2e)?
HOW BROWSERS WORK
I consider the article How Browsers Work: Behind the scenes of modern web browsers, from html5rocks, to be pure gold.