In the meantime, if you're looking for standard features or technical specifications, you can find the official documentation on the W3C EPUB 3.3 specification page .
I'm sorry, I'm not sure what you're looking for. To help me generate a deep feature for "5525 epub," could you tell me a little more about what that is? 5525 epub
For example, is "5525" a specific book title, a technical ID, or perhaps a model number? Knowing what kind of content or system you're working with will help me give you a much more relevant answer. In the meantime, if you're looking for standard