What was this worth to you?
- Did it enable you to generate cleaner html and css that is more robust? Will this help develop a better reputation for you?
- Did it save you hours of frustration?
If it was at all helpful, then please acknowledge the work effort by donating.
There may be a range from what you think it is worth, to what you can afford or are prepared to pay. It is better to give a token cup of coffee for the appreciation it communicates than to nothing.