[css] Remove "whitespace" between div element

The cleanest way to fix this is to apply the vertical-align: top property to you CSS rules:

#div1 div {
   width:30px;height:30px;
   border:blue 1px solid;
   display:inline-block;
   *display:inline;zoom:1;
   margin:0px;outline:none;
   vertical-align: top;
}

If you were to add content to your div's, then using either line-height: 0 or font-size: 0 would cause problems with your text layout.

See fiddle: http://jsfiddle.net/audetwebdesign/eJqaZ/

Where This Problem Comes From

This problem can arise when a browser is in "quirks" mode. In this example, changing the doctype from:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

to

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Strict//EN">

will change how the browser deals with extra whitespace.

In quirks mode, the whitespace is ignored, but preserved in strict mode.

References:

html doctype adds whitespace?

https://developer.mozilla.org/en/Images,_Tables,_and_Mysterious_Gaps

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