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Without CSS, a page is bare but still, something of modesty it is because browsers down a set of default properties that will be applied unless the change. Have some differences depending on whether a browser or the other but, in general, are precisely those properties non-identified, that cause us problems because we do not usually taken into account.

The body of a page is where they are defined by default some of these properties is more or less known than the bottom (background) of a page is white and the color of the text (color) is black but has some more than likely to interfere For example, the margin (margin):

body {
background: # FFF url () repeat top left;
color: # 000;
font-family: Times New Roman;
font-size: 16px;
margin: 8px;

The links also have default properties, are blue and is underlined. All title tags are in bold fonts (font-weight: bold) and also a size that is related to the size of the font defined in the body. To make matters worse, it also has limits:
h1 font-size: 2em; margin: 21px 0;
h2 font-size: 1.5em; margin: 19px 0;
h3 font-size: 1.2em; margin: 19px 0;
h4 font-size: 1em; margin: 21px 0;
h5 font-size: .8 em; margin: 21px 0;
h6 font-size: .7 em; margin: 26px 0;

Or DIV or SPAN tags have default properties but if P is labeled, this has a top and bottom margin equal to the size of the default font (margin: 1em 0).

More labels with pre-defined properties:
blockquote margin: 16px 40px;
pre font-family: monospace; margin: 16px 0;

Images that act as links have a border of color like the color of links (border: 2px solid # 0000EE) .

Probably labels cause more conflicts are lists as both OL and UL have several properties, including margins and separations:
ol margin: 16px 0; padding-left: 40px; list-style-position: outside; list-style-type: decimal;
ul margin: 16px 0; padding-left: 40px; list-style-position: outside; list-style-type: disc;

Usually we read that to avoid all these properties do not bother us, it is best to "reset", ie to the beginning of our staff, some definitions to "clean" stuff. There are dozens of examples that can be found but for normal use, do not need much, just add a few right at the beginning of our staff within <style> </ style> or <b:skin> < / b: skin>..
* {Margin: 0; padding: 0;}

html, body {height: 100%;}
body {height: 100%;}

a, a: visited, a: link, a: active {outline: none; text-decoration: none;}
a: hover {outline: none; text-decoration: none;}
a img {border: none; outline: none; text-decoration: none;}

object, embed {outline: none;}

ol, ul, li {list-style: none;}

Of course, this must be case by case and that it is possible that some of the default properties are useful and we therefore take them out but we are not interested, it's always good to know that there are and where we started a new site, it is best to remove them all and take the trouble to define them one by one.