clear

значения свойства:

values of the property:

none
left
right
both
inherit

css/style.css

.left, .right, .both {
height: 150px;
width: 400px;
border: 1px solid #808080;
}
.one, .two {
height: 50px;
width: 100px;
background-color: #3BA9DE;
margin: 5px;
}
.one {
float: left;
}
.two {
float: right;
}
.text {
text-align: justify;
}
.clear-left {
clear: left;
}

.left, .right, .both {
 height: 150px;
 width: 400px;
 border: 1px solid #808080;
}

.one, .two {
 height: 50px;
 width: 100px;
 background-color: #3BA9DE;
 margin: 5px;
}

.one {
 float: left;
}

.two {
 float: right;
}

.text {
 text-align: justify;
}

.clear-left {
 clear: left;
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
</head>
<body>
<div class="left">
<div class="one"></div>
<p class="clear-left text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<br />
<br />
<div class="right">
<div class="two"></div>
<p id="p1" class="text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<br />
<br />
<div class="both">
<div class="one"></div>
<div class="two"></div>
<p class="clear-both text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<script>
/*JavaScript*/
document.getElementById("p1").style.clear = "right";
/*jQuery*/
$(document).ready(function () {
$(".clear-both").css({ "clear": "both" });
});
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
</head>
<body>
<div class="left">
<div class="one"></div>
<p class="clear-left text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<br />
<br />
<div class="right">
<div class="two"></div>
<p id="p1" class="text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<br />
<br />
<div class="both">
<div class="one"></div>
<div class="two"></div>
<p class="clear-both text">
I was dreaming about Hawaii. I was dreaming about my holiday. In
my dream, I was on the beach in Hawaii. The hot sun was shining on
my face. The sound of the sea was all around me.
</p>
</div>
<script>
/*JavaScript*/
document.getElementById("p1").style.clear = "right";
/*jQuery*/
$(document).ready(function () {
$(".clear-both").css({ "clear": "both" });
});
</script>
</body>
</html>