// Here are some built in functions.
// They exist because the browser give them to us for free.

// Add stuff into the existing page
document.write('<p>I am a new paragraph</p>')

// Annoy the user in subtle ways...
window.alert('I am an alert message')
window.alert('I can be quite annoying')
window.alert('Developers were abusing me in the 90\'!')
window.alert('That\'s why you don\'t see me so much nowadays')

// Ask for user's input and opinions
window.confirm('Do you have any questions?')
window.prompt('What\'s your name?')