Is it possible to make a page load indication (not AJAX)?

Question

Browsers

It is necessary to visualize the loading of the page requested exactly when passing through the browser.
As you know, the body of the HTML page itself loads quickly, unless of course you embed all the resources related to it (css, js, img) into it inline. The browser spends much more time loading external resources and, as you know, works synchronously and does not allow CSS and DOM to be processed until it has loaded all the resources found.
Is there any API or hacks to visualize the loading of the entire page with a progress bar, for example, as it is done in Youtube?

Answer 1

It ?
habrahabr.ru/post/190818