Head First HTML with CSS

Step Three: save your changes and reload the page.
Well, everything should look
EXACTLY the same. But, don’t
you feel much better now that
everything is as it should be?
Q: So why did you make the selector #guarantee rather
than p#guarantee?
A: We could have done either and they both would select
the same thing. On this page we know that we will always have
a paragraph assigned to the id, so it doesn’t really matter (and
#guarantee is simpler). However, on a more complex set of pages
you might have some pages where the unique id is assigned to,
say, a paragraph, and on others it’s assigned to a list or block
quote. So you might want several rules for the id, like p#someid,
and blockquote#someid, depending on which kind of element is on
the page.
Q: Should I always start with a class, and then change it
to an id when I know it’s going to be unique?
there are no
Dumb Questions
the box model
A: No. You’ll often know when you design your pages if an
element is going to be unique or not. We only did things this way
in the chapter because, well, you didn’t know about id when we
started. But don’t you think we tied id into the story rather nicely?
Q: In Chapter 4 we used the id attribute with the
element to create a destination anchor. When I put an id on
other types of elements, do they become destinations too?
A: That’s the idea, and most modern browsers support this,
but older browsers don’t.
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