Hitachi Research Institute Bug
I came across Hitachi’s president’s blog on Linkedin for their Europe visit, but when I checked the blog, it was not mobile-friendly. I investigate further the website, and it turned out that the Japanese version has a responsive design (mobile & desktop friendly) but the English version is only desktop friendly. It is difficult to imagine how and who made such a technical decision. So this is not a real bug, but a wrong technical decision.
Bonus:
They still have the Adobe Flash download link on the top page which is the end of life of usage. Should be removed from the website immediately.