vs

Question

I am trying to understand why is there a difference in how a browser displays

verses

?

Here is an example: The expected

Answer 1

Mainly because

is not valid HTML.

If you have a look through the different doctypes you'll notice that div cannot be self closing.

According to the W3C:

A div element must have both a start tag and an end tag.

Source: http://www.w3.org/TR/html-markup/div.html

To include Chucks comment here also, a trailing slash in HTML does not a self closing tag make. Self closing tags using a trailing slash are a feature of XHTML, not HTML.

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