question about "id=" tag

[Dribbles]

In this code:

<div id="profile_tabs">

Where does the browser get the "id=" info from? the style sheet?

[Andrew Green]

it's just a unique identifier for a tag, it is set by whoever wrote the html. Useful if you want to manipulate the page via javascript / ajax as you need to be able to pick out a specific element.

[Dismounted]

When you put a URL into the address bar and click enter, the browser requests information from that resource. The server replies with some headers, and a response. This response is the HTML. Your browser simply interprets this HTML and displays it on screen.

[James Birkett]

As these 2 said, and yes, it can also be requested from a stylesheet using

#profile_tabs{
some CSS;
some more CSS;
}