That is revisionism, IE only stagnated because they kind of wipedout the competition, like Chrome is today, and Microsoft withdraw most of the development resources from the team.

WPF XAML was originally designed by ex IE team members, and they were the same that a few years later proposed XAML Grid concept as CSS Grid initial design.

Many JavaScript devs have to thank their abuse of JavaScript in the browser to XMLHttpRequest introduced by IE.

> IE only stagnated because they kind of wipedout the competition

Yeah, people forget that IE was a great browser. It was easily the most performant, I think driven by the Outlook web (I believe the first web app to make use of XMLHttpRequest) team demanding IE team make it so. The issue, like you said, is they won and then stopped updating.