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Re:The Call to Kill Adobe’s Flash in Favor of HTML5 Is Rising by pyre on Tuesday July 14, 2015 @04:23PM (#9887771)
On the other hand, those will be separate implementations on different browsers, so it reduces the applicability of any one exploit. An exploit in Flash or Java becomes cross-browser.
Re:The Call to Kill Adobe’s Flash in Favor of HTML5 Is Rising by Silhouette on Tuesday July 14, 2015 @08:11PM (#9888958)
On the other hand, those will be separate implementations on different browsers

Unless more than one browser uses, say, the same video codecs, or the same third-party DRM-related module, or the same system services for doing hardware-accelerated 3D rendering.

There may be some marginal advantage to having different implementations in different browsers, but marginal is probably all it is. Realistically, as things we used to do in the likes of Flash or Java move into browser-native implementations, there is still no reason to assume that the people writing those implementations will magically produce completely secure implementations where no-one ever has before.