It doesn't work for me either. I'm on Firefox.
That website's markup is incorrect. There are also no <html>, <head>, or <body> tags in that webpage either, which might be a good explanation of why.
Validator: http://validator.w3.org/check?uri=https%3A%2F%2Fwantrepreneu...
It's not hard at all to comply to HTML standard, and just stop worrying about compatibility. Then you wouldn't even say the words "don't support <somebrowser>", because it's their problem that their browser doesn't follow standard.