AJAX Page re-Load on page Update

Hello, everybody,
I am looking for a solution to show new content on my page while my client is already on that page (without asking visitors to reload the page.
Scenario: I am inserting a new block into page, CSS marked somehow, hit Update button and after that all visitors on that particular page can see new content as well - new version on that page, without pressing "Reload current page".

I have a look at Ajax page loaders (plugins), a lot of them are loading on scroll existing content or loading new comments, but I could not find any that helps me load new content of the page with Ajax.

Thanks in advance.