Store all frames as a ZIP file, download with a zip loader and show each frame as a blob.

[simsong]

Likely best:

• https://github.com/greggman/unzipit

Second best:

• https://yomotsu.github.io/ZipLoader/
• https://stackoverflow.com/questions/30864573/what-is-a-blob-url-and-why-it-is-used
• https://github.com/gildas-lormeau/zip.js

[simsong]

Well, this wasn't very hard: https://gists.simson.net/webapp/static/demo/demo_unzip1.html