CSS3 is cool

pseudo-element-stuff.css

[contenteditable] {
    border: 2px solid rgba(0,0,0,0);                                                                          
}
[contenteditable]:hover {
    border: 2px dashed #eeeeee;                                                                               
}                                                                                                             
[contenteditable]:empty {                                                                                                                                                                              
    border: 2px dashed #ddeeee;                                                                               
    font-style: italic;
}                                                                                                             
.my-div [contenteditable]:empty:before {                                                   
    content: "Enter some info...";                                                                
}                                                                                                             
.my-other-div [contenteditable]:empty:before {                                                   
    content: "Enter some other info...";                                                                
}