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It must be able to cache it's all content in browser. I guess to do it it properly you need to make it PWA.

• Croak 8mo ago
  You can also just use proper HTTP cache headers. ETag and a very long Expires header.
• tinuviel 8mo ago
  Idea is to keep it light and accessible. PWA would be data heavy. The use case is in the article linked in the post description.