<!doctype html>
<html>
<head>
<style>
#test1 {
    visibility: hidden;
}
#test2 {
    color: green;
}
</style>
</head>
<body>
<div id=test1>
This shouldn't be initially visible
<div>This shouldn't be initially visible</div>
</div>
<div id=test2>
This should be initially green
<div>This should be initially green</div>
</div>
</body>
</html>