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bitwise operators

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debugger statements

== and !=

ES5 syntax

eval

uncapitalized constructors

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dangling _ in identifiers

++ and --

. and [^ ... ] in /RegExp/

misordered definitions

unused parameters

missing 'use strict' pragma

stupidity

inefficient subscripting

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TODO comments

many var statements per function

messy white space

CSS workarounds

HTML event handlers

HTML fragments

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a browser

console,alert, ...

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