

Sadly I don’t see what they could have done. I don’t think international law would have allowed them to intercept the plane even if they had wanted to. It would have been a very interesting situation tho if the plane had a problem and would have been forced to make an emergency landing in one of the three countries.








Most browser compatibility issues come from JavaScript, not HTML/CSS. Unless you want to support ancient/dead browsers (like Internet Explorer or non-HTML5 browsers), it’s very likely there won’t be any issues.
MDN has a compatibility table for every HTML tag and CSS property. For a simple static site I would just manually check there.