Changes between tagged Emscripten versions are recorded in the ChangeLog
ChangeLog.md in the source repo).
This log includes high-level information about new features, user-oriented
fixes, options, command-line parameters, usage changes, deprecations,
significant internal modifications, optimizations, etc. The log for each version
links to a detailed diff report, which lists all the incremental changes since
the previous release.
The ChangeLog for Emscripten 2.0.16 (Mar 31, 2021) is listed below.