Don't use .returnValue if .defaultPrevented exists #597
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`.defaultPrevented` exists in IE9+. I checked in IE9, Chrome, and Firefox that it does default to `false`. Fixes facebook#527.
zpao
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Nov 27, 2013
Don't use .returnValue if .defaultPrevented exists
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.defaultPreventedexists in IE9+. I checked in IE9, Chrome, and Firefox that it does default tofalse.Fixes #527.