Ahem A Rivet's Shot wrote:

>> When I look opening i.e. yahoo
>> mail it loads constantly adds, or communicates with large number of
>> servers in the background, that have nothing to do with the content.
>> But at the end this is how they make the money.
>
> That's only the interactions you see, there's server side HTML
> injection going on that you never see anything of.

It is not an injection. The server can not inject anything in clients HTML
unless there is something in the HTML that would pull the "injection" and
this is most likely the JavaScript code.
Statements like yours confused me in the beginning. AFAIK the Web is still
request/response based, so something is doing the request and getting the
response on your client PC.
I have not studied the newer web push notifications, but I doubt it would be
different. I guess it would be a piece of code inside the browser that is
requesting the information from the server and displaying notification if
you have opted in.

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