HTML

viewport

Viewport = size of the screen

Useful information to know for mobile phones:
 1. "width=device-width" is saying "Use the width of the actual device"
 2. "initial-scale=1" is saying "Dont zoom in or out"
 
In practice:
<meta name="viewport" content="width=device-width, initial-scale=1"/>

viewport

    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="A page's description, usually one or two sentences." />
    <meta name="keywords" content="banana, banana facts" />

viewport

// viewport for Responsive Design
<meta name="viewport" content="width=device-width, initial-scale=1.0">

viewport

<!-- Responsive // Viewport -->
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">

ViewPoViewPort

h1 {
  font-size: 5.9vw;
}
h2 {
  font-size: 3.0vh;
}
p {
  font-size: 2vmin;
}

ViewPoViewPort

h1 {
  font-size: 5.9vw;
}
h2 {
  font-size: 3.0vh;
}
p {
  font-size: 2vmin;
}