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==Undetectables==
Some browser features are considered ''undetectable'', because no clues are known to give sufficient confidence that a feature is supported. These are often because limited information available to the JavaScript environment in the browser; generally features must be exposed via the DOM in some way in order to be
When undetectables are encountered, it is common to turn to [[User agent#User agent sniffing|user agent sniffing]] as an alternative mechanism, or to employ [[defensive coding]] to minimise the impact if the feature turns out not to be supported.
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