Function, that check if element is visible for user.
npm install is-element-user-visible
npm install is-element-user-visible
`
Usage
`javascript
var isElementUserVisible = require('is-element-user-visible');
var element = document.getElementById('example');
var config = {
element: element,
parent: element.parentNode,
percentage: 50
};
console.log(isElementUserVisible(config));
``