Are HTML documents are human readable?

Any document that a human can read and understand without requiring an interpreter (it is written in the reader's native language, for instance). Machine code is not human-readable, it is intended to be read by a machine. Assembler language is a symbolic language that is essentially a human-readable form of machine code, however it's not easily understood by everyone except those familiar with Assembler language. High-level languages are more easily understood by most programmers, particularly those familiar with the language, while pseudocode is an abstract language intended to be human-readable even by non-programmers.