Since emoji has now been official added to the unicode 7 spec and has been named the worlds fastest growing language, would it make sense to introduce a standards way of invoking an emoji picker?
OSX currently allows the user to insert emoji into an input type text|email or a textarea (see screengrab) yet there's no way (I'm aware of) to invoke this keyboard through code.
Several web services (Slack for example) implement their own versions of these emoji pickers. However, unicode 8 (released June 2015, but I've yet to see implement anywhere) introduced 37 new emoji and 5 new diversity modifers, unicode 9 (set for release next year) is already considering an additional 40 something emoji... Instead of web developers racing to keep up their own implementations of the spec it would make sense for this to happen on a OS and browser level no?
Without getting too sucked into implementation, perhaps this could be a boolean attribute like...
<input type="text" emoji>
Which could add some sort of button to the inout (similar to input type=number) which would then invoke the keyboard.