[attribute~=value]

css/style.css

[value~=sea]{
background-color: #FFFFCC;
}

[value~=sea]{
 background-color: #FFFFCC;
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
</head>
<body>
<input type="text" value="sea" />
<br />
<br />
<input type="text" value="seaman" />
<br />
<br />
<input type="text" value="search a sea" />
<br />
<br />
<input type="submit" name="ok" value="OK" />
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<link href="css/style.css" rel="stylesheet" />
</head>
<body>
<input type="text" value="sea" />
<br />
<br />
<input type="text" value="seaman" />
<br />
<br />
<input type="text" value="search a sea" />
<br />
<br />
<input type="submit" name="ok" value="OK" />
</body>
</html>