On Sun, 16 Aug 2020 03:05:35 +0200, Axel Berger wrote:

> Martin Gregorie wrote:
>> They are generally NOT added by the web page's author:
>
> We're beginning to lose ourselves into semantics here. The page's author
> is the one who wrote that which leaves the server and arrives at the
> browser: the HTML, CSS, JS etc. Whether he wrote static code or a
> program generating it only a question of tools. If I decide to quote a
> poem of Goethe's on one of my web pages, that doesn't make Goethe the
> page's author. If the "free" servers work as you say, I wouldn't know,
> then you are not the author of the page, but its true author generously
> allows you to add a bit of prose of yours to *his* page.

I was being specific here, deliberately describing something everybody
has seen:a Wikipedia page.  Here the page content (text and images) is
obviously written by a volunteer editor and sits in some sort of datastore
in more or less the format that its author and contributors hit save on.
This is what I meant by the 'page content' When a page is requested, more
stuff gets added:

- the standard Wikipedia header and footer (not written by the author,
  but no more contentions than the content of the HTML  section).
  These always have the same format but not written by the page author.

- the half screenful of donation request that gets added every time
  Wikipedia needs more cash. To me this is no different to any other
  advert, and again is not written or supplied by the page author.

I'm only describing it this way to emphasize to the OP that a web server
can and does inject additional material into a web page before it is sent
to the browser.

Similarly, the browser can only display the content of the page it
receives with the following exceptions:

- it can and does use  tags to retrieve and display images, which
  may or may not come from the same server as the HTML text containing
  them. These tags are in the web page as received from the server.

- code such as ad-blockers running in the browser can and does prevent
  the content these tags reference from being displayed, but cannot
  inject text, image selection tags, etc that were not on the HTML page
  sent by the server

I'd remind you that the OP seemed certain that:

- the web server could not modify the page it sends to the browser

- the browser could does add additional material to the page it received
  from the browser.

--
Martin    | martin at
Gregorie  | gregorie dot org

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