[Mekkanox]

Indeed. Anecdote: Several years ago I worked on a U.S. GOSS (Government Open-Source Software) project that was a web app that allowed different apps running on different domains to function as "widgets" and allowed cross-domain communication between these apps in a drag-and-drop window environment in the browser. The intention was small apps could be composed into larger apps by allowing them to communicate with each other in this environment.

It supported multiple browsers, including IE7 in as late as summer 2014, because end-users in the U.S. Navy had machines that only had IE7. Countless man-hours (and U.S. taxpayer dollars) were spent to ensure all features worked in IE7, including drag-and-drop and responsive UI.

That project was the single biggest driver for me to get the hell out of the government contracting world and into the "truly" private sector. At least at a startup I can say more or less "if it works in Chrome, it works."