doctype html
html
  body
    h1 Hellow World!
    p goodbye!

doctype html
html(lang='en-us')
  head
    meta(http-equiv='Content-Type', content='text/html; charset=utf-8')
    meta(http-equiv='X-UA-Compatible', content='IE=edge,chrome=1')
    meta(name='viewport', content='width=device-width, initial-scale=1.0')
  body
    h1 Hellow World!
    p goodbye!

Add `head` element and meta tags
Add `head` element and meta tags

- Force IE to use the most modern version
- Set characterset to utf-8
- Don't zoom out on mobile
