Chromium has always existed. Originally it was wrapping web kit and later they forked web kit into blink and diverged from Web kit. Chromium is a level above the engine.
WebKit is a rendering engine which is one of the major components of a web browser. Chrome/Chromium was released in 2008 using a modified version of WebKit as its rendering engine. Eventually in 2013 they created a fork of WebKit called Blink, which is the current rendering engine for Chrome/Chromium.
Pre-Chromium Edge wasn't even that bad. Sure, the engine had its issues and there was probably a bit of Edge-specific JS on some websites, but I'm sure they would've eventually got there.
But seeing that even Microsoft abandoned making their own browser engine, it goes to show how complex it is to make one nowadays and with new web APIs/features coming out every few weeks it feels like, it's almost impossible to keep up.
But seeing that even Microsoft abandoned making their own browser engine, it goes to show how complex it is to make one nowadays and with new web APIs/features coming out every few weeks it feels like, it's almost impossible to keep up.
No, Microsoft is just historically bad at making browsers. It was not until Internet Explorer 7 that they finally implemented HTML 4 and CSS 2 without major glaring bugs.