# using WebSockets is mandatory, 
# since otherwise WebIO won't load additional code
using WebSockets
using WebIO, Interact
s = @manipulate for i in 1:10
	"hello number: $i"
node(:div, s, style = Dict(:height => 80))

This will show WebIO not detected as long as you don't start and execute this notebook! This happens, because WebIO needs a running Julia process to display any output.