Depending on who you talk to, you should have been using HTML5 months, nay years ago; or it's something you might be using in 2022. As usual the truth is somewhere between the glib extremes. There's no one-size-fits-all answer to questions of platform choice: you have to consider the benefits for your own scenario. But with HTML5 I'd say if you haven't switched yet, for most people it's probably time - there's a form of "switching" that will work for you. Some people seem caught up on the problem that many features have very poor support across browsers; or are simply put off by the thought of redoing their entire code base. Really though, you don't have to rebuild everything, not use everything in HTML5 for it to be worthwhile switching your doctype now. Over the past few months I've switched a large application and a few small sites to run the HTML5 doctype. Most have been seamless, with just one website exploding on contact ...
Mentations of an Oracle Developer