You can create a local world that saves to your browser's "Local Storage." Note that clearing your browser cache may delete your progress, so it is wise to export your world files regularly.
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Because it runs on JavaScript and WebGL, it is highly optimized for low-spec hardware. It often runs smoother on a cheap laptop than the original Java version. You can create a local world that saves
Runs on Chromebooks, school computers, and old laptops. and old laptops. Yes
Yes, but with a caveat. (like Hypixel or Mineplex). Because Eaglercraft is a re-write, it speaks a different network protocol.