In 1995, a Netscape employee wrote a hack in 10 days that now runs the Internet

Netscape engineer Brendan Eich created JavaScript during a 10-day sprint in May 1995, designing a lightweight scripting language to make webpages interactive for non-professional programmers. Today, JavaScript powers 98.9 percent of websites with client-side code and has become the dominant programming language of the web, extending beyond browsers to run servers, mobile apps, and desktop software. Despite its rushed development leaving behind quirks that developers still complain about, JavaScript has outlived most of the 28 major tech companies that originally endorsed it.