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JavaScript[1] is

a general purpose, cross-platform scripting language, whose code can be embedded within standard Web pages to create interactive documents.[2]


"Within the context of the Web browser, JavaScript is extremely powerful, allowing prepared scripts to perform essentially the same actions as those a user could take. Within that context, JavaScript lacks methods for directly accessing a client file system or for directly opening connections to computers other than the host that provided the content source. The browser also normally confines a script’s execution to the page from which it was downloaded."[3]


  1. The name JavaScript is a misnomer since the language has little relationship to Java technology and arose independently from it.
  2. NIST Special Publication 800-44, at 6-10.
  3. Id.