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Asked: 2026-05-18T03:11:52+00:00

a very basic question: When I include the DOCTYPE at the beginning of my

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a very basic question:

When I include the DOCTYPE at the beginning of my .html document:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

It messes only a small part styling of the page.

Here you can see a live example:

Without DOCTYPE (Right) – With DOCTYPE (Wrong)

I think I kind of “know the answer”, (besides that the HTML and CSS seems to be written by a smart chimp), the problem seems to be that some of the elements of the CSS I’m using are not part of the standards of the DOCTYPE I’m using and because of this, some parts are not loaded (in plain English).

That’s just me guessing but if this is the case, I would like to know which elements am I using that I should´t and (if specific enough) a “general guide” as to how should they be used.

Thanks in advance!

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1 Answer

  1. Editorial Team

    Try adding px after the 700 in your body style (and everywhere you specify a width in css)

    The reason for this is that adding a doctype puts the browser into standards mode (a good thing). You should run your css through a validator to catch errors you get in standards mode.

    Sorry! We found the following errors (5)

    line # Error

    2 body Value Error : width only 0
    can be a length. You must put a unit
    after your number : 700 700

    18 p.titulo Property text-shadow
    doesn’t exist in CSS level 2.1 but
    exists in : 2px 2px 2px #aaa 2px 2px
    2px #aaa

    140 #rect Value Error : width only 0
    can be a length. You must put a unit
    after your number : 235 235

    151 #form Value Error : width only 0
    can be a length. You must put a unit
    after your number : 235 235

    174 #navcontainer ul Value Error :
    margin only 0 can be a length. You
    must put a unit after your number : 5
    5

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