@lucideer You should read the HTML5 specification because you are making assumptions that are simply wrong.

"surely never intended" -- you are aware that the HTML5 menu element *is intended* for toolbars, menus and context-menus? And that the menu element should be hidden by default by supporting user-agents?

Using the HTML5 menu element for jump-lists is the exact purpose it was designed for. Microsoft are doing every other vendor and every developer absolutely no favours with the metatag overload. It's narrow-minded and a standard desktop-centric view of the browser--which as we know is now no longer the only type of webbrowser. Microsoft added favicon.ico because they assumed that the web was (or should be) entirely viewed from a Windows PC. They are making the same mistake today.