javascriptCHeck if DOM element is visible in current viewport

var el = document.querySelector('div');
var rect = el.getBoundingClientRect();
var is_visible = rect.top >= 0 && rect.left >= 0 &&
                 rect.bottom <= (window.innerHeight || document.documentElement.clientHeight) &&
                 rect.right <= (window.innerWidth || document.documentElement.clientWidth);ctrl + cyoutubegithub

`document.querySelector('div')` select needed DOM element	`el.getBoundingClientRect()` gets element coordinates relative to viewport
`is_visible` will contain `true` if element is visible in the current viewport

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