So you can tweak the positional difference between the placeholder text and value simply by tweaking the padding or line-height using that pseudo-element selector: input[type=text] { padding:4px; } input[type=text]::-webkit-input-placeholder { padding-top:5px; } Or whatever.
Identifying and describing action-reaction force pairs is a simple matter of identifying the two interacting objects and making two statements describing who is pushing on whom and in what direction. For example, consider the interaction between a baseball bat and a baseball.
I was conservative when I said 5 ounces weighed 25 pounds when thrown at 100 mph. 25 pounds represents the average force. In the case of throwing the baseball it starts off at zero speed and is then accelerated to 150 ft./s. The peak acceleration is actually higher than 3000 ft./s-s. Which means the peak dynamic weight is greater than 29 pounds.