1) They helped a bit. I donβt know how exactly an excellent reasonable amount.
2) This is definitely doable, maybe it's just a C ++ engine that you will need to wrap in Qt.
3) Keep in mind that while Chromium uses a modified version of WebKit, they also download other tools working on top of it to gain experience like this.
4) Differences such as these have such different needs. WebKit needs to be used to a large extent in many aspects, Chromium just has to be as good as possible.
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