rgba.php: an elegant and miniature “crutch” provides backward compatibility with browsers that do not understand the translucent colors of rgba (...)
Ensuring rgba (...) backward compatibility 
has never been easier 
than copy + paste:background: url('/rgba.php/rgba(255, 255, 255, 0.3)'); background: rgba(255, 255, 255, 0.3); 
The 
rgba.php code in PHP, which accomplishes this amazingly simple trick, lies 
on GitHub under the MIT license . It occupies 
only 2658 bytes.The author is Lea Verou . Praise her!
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Source: https://habr.com/ru/post/137741/
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