I have seen that the term “Low Javascript” appears several times, but I don’t know what that means. Google does not show results surprisingly. Can someone shed light on him?
I would say that it is "javascript without using cross-browser frameworks" such as jQuery or YUI.
It can be especially difficult when it comes to supporting multiple browsers.
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bitwise operation, logical type / short circuit conversion operators, prototype chain, context binding, triple binding, bubbling / event distribution, object binding, GPU usage, etc.