An observable interface to the page visibility api
npm install observ-visibility> An observable interface to the page visibility api
``
$ npm install --save observ-visibility
`js
var Visible = require('observ-visibility')
var visibile = Visible()
visible()
//=> true
// switch tabs...
visible()
//=> false
`
#### visible([fn]) -> boolean / function
##### fn
Type: function`
An optional function to call when the visibility state changes. If no value is provided, the current visibility state is returned. If a function is provided, an unlisten function is returned.
MIT © Ben Drucker