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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 detetable using JavaScript.
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.
The [[Modernizr]] project maintains a record of known undetectables on their [http://github.com/Modernizr/Modernizr/wiki/Undetectables wiki].
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