What is polyfill.js used for?

[whitea2]

What is the purpose of "https://cdn.polyfill.io/v2/polyfill.min.js" ?

I noticed on the polyfill.js site that it is no longer maintained. Can I safely comment the following to remove the need for polyfill.min.js?
$html = '<script src="' . $this->getPolyfillJs() . '"></script>' . PHP_EOL;"

[albertcht]

Hi @whitea2,

polyfill.js is for patching unsupported js apis for old browsers (like IE). And as far as I know, polyfill.js is still under maintainacne.