That is a bit difficult when you haven't said which bit you don't understand.

The document root tells Apache the location from which it is allowed to serve files from. So yours is /www/articles/htdocs

That is quite "Normal" looking. In most cases the document root is "htdocs" - that is why it is called htdocs.

So all your css, html, js etc files MUST be in /www/articles/htdocs (or subfolders thereof).

You cannot put files in the /www folder or even the /www/articles folder and expect Apache to be able to serve them to the browser. So where does "mobile.css" live in your file structure. If it isn't in your htdocs folder then Apache cannot find it.

Typically, if you want to keep your css files separate from everything else you could put them in (for example) /www/articles/htdocs/css
Your "href" tag in your html should then be "/css/mobile.css"

The "/" means "from the document root. So "/css/mobile.css" means "/www/articles/htdocs/css/mobile.css"

If you leave off the leading "/" then that means "relative to the current location" so when you have "href" as simply "mobile.css" then Apache will look for it in the same folder as the HTML file that references it.....and it sounds like its not there.

-----Original Message-----
From: WEB400 [mailto:web400-bounces@xxxxxxxxxxxx] On Behalf Of gio.cot
Sent: 30 January 2017 11:35
To: web400@xxxxxxxxxxxx
Subject: Re: [WEB400] external CSS style sheets problem

Hi Kevin

Sorry but I have not understand your answer .. could you please better explain me ?

Thanks in advance

<< Right - so that means that your Apache instance can only serve documents from the location (or subfolders thereof). So if your HTML says this:
<< <link rel="stylesheet" type="text/css" href="mobile.css"> << Apache will expect to find mobile.css in www/articles/htdocs << That is the point of the document root. It tells Apache where to get the static files from that you reference in your HTML. All other files are protected from access

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