The Act of Including the Doctype Ruins the Design

I've been working on a tab menu without adding the doctype statement. It seems to be functioning perfectly from my perspective, but as soon as I include the or any other type of Doctype, the layout gets completely messed up. Here are three images illustrating the issue:

1.) Expanded Window (without doctype)

2.) Contracted Window (without doctype)

3.) Contracted Window (WITH doctype)

I'm utilizing the :after pseudo-element to position the right side of the "sliding door" with the following code snippet:

#nav li:after {
    width:10px;
    content:"";
    background: url('tabRight.png');
    position:absolute;
    height:100%;
    top:0;
    right:-10;
}

As I am relatively new to web development, I am unsure about what could be causing this issue. Any assistance at this point would be greatly appreciated. Thank you!

HTML:

<div id="nav">
<ul>
    <li id="dead">
        <a href='javascript: toggle()'>
            <div script="padding-left:5px;">
                <img class="navImg" src="dead32.png" />
                <p class="navTxt">Deadlines</p>
            </div>
        </a>
    </li>
    <li>&nbsp;&nbsp;About</li>
    <li>&nbsp;&nbsp;Address</li>
</ul>
</div>

EDIT:

The right:-10; is the root of the issue. If I change it to right:0;, the layout returns to normal. However, this adjustment causes the "sliding doors" not to function as intended. The transparent edge of the right sliding door reveals the grey background when overlapping the left sliding door, which is not the desired outcome.

Answer №1

When there is no doctype present, the layout behavior in quirks mode can vary significantly from strict mode. For more information on quirks/strict modes, visit this link.

Answer №2

If you happened to write your code and CSS without including a DOCTYPE in the header, this means that your browser is operating in quirks mode by default, which indicates that it does not know how to properly display the elements. It is crucial to include a doctype declaration in the header because certain browsers like Internet Explorer can completely ruin the layout of your website.

My recommendation would be to add a transitional doctype and then begin writing your code and CSS. This can help prevent any browser compatibility issues from arising.

For example, when creating a new HTML template in Dreamweaver, the following code snippet is generated:

<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
</body>
</html>

Answer №3

The Document Type Definition dictates the specific interpretation of tags by web browsers. XHTML, being an XML-based language, enforces strict rules such as proper opening and closing of tags (including case sensitivity).

It is possible that your website does not adhere to the stringent DTD guidelines, resulting in display discrepancies.

Answer №4

Just a heads up, I suggest incorporating a Strict DTD (which is always a good practice) and developing your code in alignment with it. Additionally, implementing a CSS reset selector is generally a wise move.

*{
   margin: 0;
   padding: 0;
 }

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