How do you make <div>s display inline?

<div>foo</div><div>bar</div><div>baz</div>

<style type="text/css">
div.inline { float:left; }
.clearBoth { clear:both; }
</style>
<div class="inline">1<br />2<br />3</div>
<div class="inline">1<br />2<br />3</div>
<div class="inline">1<br />2<br />3</div>
<br class="clearBoth" /><!-- you may or may not need this -->

<span>foo</span>
<span>bar</span>
<span>baz</span>

<div style="display: inline">a</div>
<div style="display: inline">b</div>
<div style="display: inline">c</div>

===== ======= ==   **** ***** ******   +++++ ++++
===== ==== =====   ******** ***** **   ++ +++++++
=== ======== ===   ******* **** ****
===== ==== =====                       +++++++ ++
====== == ======

====== ==== ===== ===== == ==== *** ******* ***** *****
**** ++++ +++ ++ ++++ ++ +++++++ +++ ++++

<div style="float: left;" >
  <p>block level content or <span>inline content</span>.</p>
  <p>block level content or <span>inline content</span>.</p>
</div>
<div style="float: left;" >
  <p>block level content or <span>inline content</span>.</p>
  <p>block level content or <span>inline content</span>.</p>
</div>
<div style="float: left;" >
  <p>block level content or <span>inline content</span>.</p>
  <p>block level content or <span>inline content</span>.</p>
</div>

/* below is a set of hacks to make inline-block work right on divs in IE. */
html > body .ib { display:inline-block; }
.ib {display:inline-block;position:relative;}
* html .ib { display: inline; }
:first-child + html .ib { display:inline; }

<style type="text/css">
div.inline { display:inline; }
</style>
<div class="inline">a</div>
<div class="inline">b</div>
<div class="inline">c</div>

div.contain
{
  margin:3%;
  border: none;
  height: auto;
  width: auto;
  float: left;
}

div.contain div
{
  diplay:inline;
  width:200px;
  height:300px;
  padding: 15px;
  margin: auto;
  border:1px solid red;
  background-color:#fffff7;
  -moz-border-radius:25px; /* Firefox */
  border-radius:25px;
}

<div class="contain">
  <div>Foo</div>
</div>

<div class="contain">
  <div>Bar</div>
</div>

<div class="contain">
  <div>Baz</div>
</div>

wrapperline{
width: 300px;
float: left;
height: 60px;
background-color:#CCCCCC;}

.boxinside{
width: 50px;
float: left;
height: 50px;
margin: 5px;
background-color:#9C0;
float:left;}

<div class="wrapperline">
<div class="boxinside">Box 1</div>
<div class="boxinside">Box 1</div>
<div class="boxinside">Box 1</div>
<div class="boxinside">Box 1</div>
<div class="boxinside">Box 1</div>
</div>