<!DOCTYPE html>
<html>
<head>
<style>
span {
color: transparent; /* workaround for bug 617524 */
outline: 1px solid green;
}
</style>
</head>
<body>
<input>
<input readonly><span>hide me</span>
<input type=password>
<input type=password readonly><span>hide me</span>
<input type=email>
<input type=email readonly><span>hide me</span>
<textarea></textarea>
<textarea readonly></textarea><span>hide me</span>
</body>
</html>