<meta name="viewport" content="...">
Forces screen to scale to optimum page width
<meta name="viewport" content="width=916">
Helps font resizing
<meta name="viewport" content="width=device-width">
Be a cool kid Boilerplate to protect iOS scaling defects. Also you may want to use default font size and reset css.
<meta name="viewport" content="width=device-width,initial-scale=1">