Recently, I was reminiscing about the <plaintext>
tag.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/plaintext
It made me think of trying this silly JS snippet experiment.
Pasting it into the dev tools console will show a "view source" of the page.
document.documentElement.innerHTML =
`<plaintext>${
document.documentElement.innerHTML
}`
.replace(/\n\s+/g, '\n');