<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Herencia</title>

<style type ="text/css">

#caja #caja1 header h1{color: #DDFC01;}




#caja .cabecera h1 {color: #3CD127;}




header h1{color: #3CD127;}


h1{color: #3CD127;}
h1{color: #2799D1;}


</style>

</head>
<body>
<div id="caja">
<header class="cabecera">

<h1>Cabecera: header</h1>


</header>
</div>
</body>
</html>
</div>