The Emscripten toolchain has extensive features/customizations, the most commonly used of which are introduced in previous sections.
From personal experiences, two source files are commonly consulted, which are:
emsdk/emscripten/<sdk_ver>/src/settings.jsemsdk/emscripten/<sdk_ver>/system/include/emscripten.h
The former one contains all compile options are their explanations; the later one contains the declarations of special functions such as emscripten_set_main_loop()/emscripten_run_script().
Of course, for readers who hope to delve into Emscripten, the official website https://kripken.github.io/emscripten-site/ is an indispensable information source.
This marks the end of basic introduction to Emscripten. Following chapters will focus on common problems and their solutions in real world projects.