What is the reason for having a space between the <body> and the <html> tags?

Can you explain why there is a gap between the top of the green box and the browser window in Chrome and Firefox?

I've tried various CSS configurations to eliminate the apparent space between the html and body elements, but it seems that some padding or margin is not being reset to 0. Additionally, there appears to be extra padding on the overall document height which I'm struggling to remove.

Here's a helpful tip:

The issue was resolved by using the following code:

div#aiport > *:first-child { margin-top: 0px }

Simply adding

overflow: hidden;

to the div#airport definition managed to solve the problem effectively. :-)

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>bug</title>
        <link rel="icon" type="image/png" href="bookmarkIcon.png" />
        <style type="text/css">
            html {
                height: 100%;
                min-height: 100%;
                padding: 0px;
                margin: 0px;
            }
            body {
                margin: 0px;
                padding: 0px;
                margin-top: 0px;
                padding-top: 0px;
                width: 100%;
                height: 100%;
                font-size: 16px;
                background: #fff;
            }
            div#airport {
                position: relative;
                z-index: 1;
                top: 0px;
                padding: 0px;
                padding-top: 0px;
                margin: 0px;
                margin-top: 0px;
                margin-left: auto;
                margin-right: auto;
                width: 900px;
                min-width: 900px;
                max-width: 900px;
                background-color: #0f0;
            }
        </style>
    </head>
    <body lang="en">
        <div id="airport">
            <p>Platform</p>
        </div>
    </body>
</html>
htmlcss

Answer №1

The reason is that the margin of your <p>Platform</p> element extends outside its containing <div id="airport"> and shifts it away from the <body>.

Answer №2

The top margin on the p tag inside the #airport element is causing the space.

To eliminate the space, you can remove the default top margin by adding inline styling to the p tag. Here's an example:

<div id="airport">
    <p style="margin:0;">Platform</p>
</div>

Check out this code snippet on jsFiddle

Answer №3

A misalignment has been detected. Adjusting the #airport to top: -20px; will ensure proper alignment and presto, it disappears.

Answer №4

To center a div using absolute positioning, apply margin-left: -(50% of the div's width in pixels).

Answer №5

I made some adjustments to your CSS:

body {
                margin: 0;
                padding: 0;
                width: 100%;
                height: 100vh;
                font-size: 16px;
                background: #fff;
            }
            div#airport {
                position: relative;
                z-index: 1;
                top: 0;
                padding: 0;
                padding-top: 0;
                margin: 0;
                margin-top: 0;
                margin-left: auto;
                margin-right: auto;
                width: 900px;
                min-width: 900px;
                max-width: 900px;
                background-color: #0f0;
            }​

You can view the updated code here http://jsfiddle.net/xfhyq/

Answer №6

When the P tag appears as the initial tag with text, it can create a frequent CSS issue. To resolve this problem, consider incorporating 

body > div:first-child > p:first-child { margin-top: 0; }
into your CSS code.

Answer №7

By default, there is a margin set on the body element.

To remove this margin, you can add the following CSS code:

body{
    margin:0;
}

Answer №8

Adding a bit of padding to the main div could potentially address this issue.

    div#airport {
    ...
    padding: 1px;
}

Answer №9

Answered by lanzz: The reason for this issue is the <p>Platform</p> element, which has a default margin that causes it to extend beyond its parent 

<div id="airport">
element and push it away from the <body>.

To fix this, you can add margin: auto in your styles to prevent this behavior.

#airport p {
  margin: auto
}

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