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The HTML is parsed, JavaScript is executed, and the result is the DOM. The content of a web page is not (just) source code, it’s the DOM. This makes it pretty important.
"For fun," he built a complete PC emulator in JavaScript, and then used it to run a fully functioning version of Linux in a web browser. How did it turn out?
But disallowing JavaScript by default and selectively enabling it for specific sites remains a much safer option than letting all sites run JavaScript unrestricted all the time.