All code can be on one line if you do not need to insert data from blocks into this code. I break the code into blocks either for convenience of demonstration, or for receiving more universal decision. If you paste the entire code into one block, then to copy the functions from it, you will have to look for this function in the entire code. It is more convenient to store universal functions in separate blocks.
Please note that the code will not work in applications installed on iOS, because they do not support data URI