Display a Digital Clock
HTML + JS (ES6), 8 + 60 = 68 bytes

Tested in Chrome.



setInterval`a.innerHTML=new Date().toLocaleTimeString('fr')`
&lt;a id=a&gt;




-1 byte (@ETHProductions): Use French time format instead of .toTimeString().slice(0,8)



HTML + JS (ES6), 8 + 62 = 70 bytes

This will work in FireFox.



setInterval('a.innerHTML=new Date().toLocaleTimeString`fr`',0)
&lt;a id=a&gt;




-3 bytes (@ETHProductions): Use French time format instead of .toTimeString().slice(0,8)