And they all had crippling security problems[1]. I only mentioned the JVM, but you're right, all of those technologies contributed to the work of secure sandbox

And they all had crippling security problems[1]. I only mentioned the JVM, but you're right, all of those technologies contributed to the work of secure sandboxes. [1]: Except maybe Silverlight. From what I remember, it didn't see enough success to be a tempting target for hackers.