From the comment, “Don’t forget to apply the styles above to your iframe!”, I assume there’s something that needs to be done to the line, but I guess I’m even less of a coder than are you, as I don’t even know how to look at the source of his example. I right-clicked on the scrolling frame and selected “View page source”, but I think that’s showing the source for this entire page, not just the scrolling window/frame, and when I search in that source-code for “<iframe", I still don't see any modifications to the "<iframe src=…" line.
Stream ciphers are often used for their speed and simplicity of implementation in hardware, and in applications where plaintext comes in quantities of unknowable length like a secure wireless connection. If a block cipher (not operating in a stream cipher mode) were to be used in this type of application, the designer would need to choose either transmission efficiency or implementation complexity, since block ciphers cannot directly work on blocks shorter than their block size. For example, if a 128-bit block cipher received separate 32-bit bursts of plaintext, three quarters of the data transmitted would be padding . Block ciphers must be used in ciphertext stealing or residual block termination mode to avoid padding, while stream ciphers eliminate this issue by naturally operating on the smallest unit that can be transmitted (usually bytes).