Datepicker Support in IE11 and Firefox

Question

What is wrong with this simple HTML page that a date picker is not shown in FireFox 30.0 and IE 11?

Answer 1

It is already in Firefox since version 51 (January 26, 2017), but it is not activated by default (yet). To activate it:

Go to "about:config" in your address bar, then search for the dom.forms.datetime property and set it to true.