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Strange margin-top problem_html/css_WEB-ITnose

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Jun 24, 2016 pm 12:14 PM

<!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" /></head><body><div style="height:419px;width:192px;background:url(images/1263871225.jpg)">  <div style="margin-top:100px">    </div></div></body></html>

This code appears under Firefox or IE8 (I haven’t tried other browsers), and the margin-top of the inner div stretches the outer layer.
Please tell me what is the reason for this?
Attach pictures

Reply to the discussion (solution)

Use relative positioning

ie, firefox
defined, body The body sizes are different.
You need to first
body{
margin:0;
padding:0;
}

The outer layer will overlap without setting a border.

The outer layer overlaps without setting a border.
Keyword: Margins are invalid when layers are nested.

Use pading-top

Set overflow:hidden; in the parent element to solve the problem. If you have any questions, send them to the email address on the site and we will help you solve them tomorrow

Thank you, d945332077, brother, I found that float:left can also be used. This problem has troubled me for a long time. I have been working on the front end for a long time, and I think I am quite familiar with it. However, this problem makes me completely doubt whether I know div css, haha

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