Why do web paragraphs break, while print paragraphs indent?

Both indentations and line breaks create a strong disruption that signals "this is a new paragraph" to the user.

Question: Several decades into web browsers becoming a major form of communication, web browsers use new lines for each paragraph, while printed books and magazines still use indentations. Certainly e-books are often printed as paper-books, and printing houses want to save paper by condensing the number of pages printed. Why wasn't the <p> tag developed to also use an indentation?

Author Erika Hall on Medium, using line-break paragraphs:

Author Erika Hall in her e-Book, Just Enough Research: