alt Hacker NewsAs of a week ago their pre-alpha version was capable of running my extremely heavy JS+ SVG + worker thread + SSE app, a bit slowly I admit but correctly in all major exercises I tried. So, I'm optimistic. They're doing great.
Separately I wonder if the compatibility job is easier now that you can just give the HTML5 spec to Fable and Bob's your uncle.
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The browser might reach 95-97% compatibility eventually. But the last 3-5% gaps are the most stubborn. Many of these 3-5% are not trivial API calls. They might be some subtle legacy quirks, timing/rendering things, etc. There is a lot of poorly written historical code that might be illegal by web standards but browsers are forced to support. Established browsers have decades of patches and regression testing.
But I agree, it's impressive. My blog uses a lot of modern CSS features (such as nested selectors), and this latest version rendered almost perfectly. Much better than Servo. Still, this small gap is often the difference between a normal browser and a browser that is a pain. Safari has much, much better compatibility, but even then this browser is hated for it's quirks, because even much smaller compatibility gaps are quite noticeable.