clip

значения свойства:

auto
rectangle
inherit

css/style.css

* {
margin: 0;
padding: 0;
}
.text {
text-align: justify;
}
.a, .b, #div1, .c {
height: 100px;
width: 300px;
background-color: #E3E3E3;
margin: 10px;
}
.a {
position: absolute;
clip: auto;
}
.b {
position: absolute;
top: 150px;
clip: rect(0, 275px, 75px, 0);
}
#div1 {
position: absolute;
top: 300px;
}

* {
 margin: 0;
 padding: 0;
}

.text {
 text-align: justify;
}

.a, .b, #div1, .c {
 height: 100px;
 width: 300px;
 background-color: #E3E3E3;
 margin: 10px;
}

.a {
 position: absolute;
 clip: auto;
}

.b {
 position: absolute;
 top: 150px;
 clip: rect(0, 275px, 75px, 0);
}

#div1 {
 position: absolute;
 top: 300px;
}

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="a 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.
</div>
<div class="b 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.
</div>
<div id="div1" 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.
</div>
<div class="c 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.
</div>
<script>
/*JavaScript*/
document.getElementById("div1").style.clip = "rect(0, 250px, 50px, 0)";
/*jQuery*/
$(document).ready(function () {
$(".c").css({ "clip": "rect(0, 225px, 25px, 0)", "position": "absolute", "top": "450px" });
});
</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="a 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.
</div>
<div class="b 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.
</div>
<div id="div1" 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.
</div>
<div class="c 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.
</div>
<script>
/*JavaScript*/
document.getElementById("div1").style.clip = "rect(0, 250px, 50px, 0)";
/*jQuery*/
$(document).ready(function () {
$(".c").css({ "clip": "rect(0, 225px, 25px, 0)", "position": "absolute", "top": "450px" });
});
</script>
</body>
</html>