tricks/support/viewport.js

ES6 modules

import insertBefore from '../dom/insertBefore.js';
import create from '../dom/create.js';

// Insert Meta Tag
insertBefore(create('meta', {
	name: 'viewport',
	content: 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no'
}), document.getElementsByTagName('script')[0]);