virtual dom
It's a simulation of the DOM that isn't immediately rendered. By not rendering immediately you can make changes quicker and more selectively.
wasm
Essentially assembly code for the web. Other languages might compile to this.
asm.js
Predecessor of wasm that uses much of the same principles but is just JS. Uses some tricks to optimize code. No longer relevant.
service workers
Afaik just non-memory sharing threads for the web.
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It's a simulation of the DOM that isn't immediately rendered. By not rendering immediately you can make changes quicker and more selectively.
Essentially assembly code for the web. Other languages might compile to this.
Predecessor of wasm that uses much of the same principles but is just JS. Uses some tricks to optimize code. No longer relevant.
Afaik just non-memory sharing threads for the web.