Re: WebAssembly & Blazer
Looking at HTML5test.com, most of the major browsers are reasonably compliant, with Imbecile Explorer being the a serious laggard. Edge is competitive with Firefox and better than Safari and worse than Chrome. So for generic website, you can probably ignore the deficiencies of Edge as you are likely to use Safari as your baseline for feature support since Imbecile Explorer is being slowly exterminated by Slurp.
The problems with Edge had nothing to do with standards support, it is quite reasonable but with how badly it was rushed out. This gave it a noticeable alphaish feel to users which was a major turn off. It never recovered. Its guilt by association with the t*rd Imbecile Explorer also meant that it had to be a grand slam from day one or it will in trouble.