The Dangers of Browser Detect

The Dangers of Browser Detect

Browser detection is something of a cat-and-mouse game, with manufacturers always finding new ways to convince scripts they’re IE or someone else and scripters finding cunning ways to reveal their true identity.

Browser detection doesn’t always work. This is the first, and clearest, danger. Browser vendors have been avoiding browser detects since 1994 by changing their navigator.userAgent value to what the browser detects script expect. Does the script expect “MSIE”? Then the user agent string contains “MSIE”, even though the browser is not in fact Internet Explorer.

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