The question about "Where's the code?" has been answered by another commenter, but a quick observation about "praise" for Microsoft's decision regarding Edge:

I'm not sure it was praise as much as relief. As someone who lived through the dumpster-fire years of Internet Explorer (IE) dominance, I was relieved that Microsoft wasn't still going their own way. They would use something more or less standard. I don't think I was alone in that relief. That may have sounded like praise.

Of course, there's a completely different question about whether Chrome/Chromium is becoming the new IE, at least in the sense that standards matter less than "the way Chrome does it." But (hopefully) that's still an open question.