Yes. So?
> And you know the JVM ran in the browser almost 20 years ago,
And it did such a good job that everyone has been prefering java applets to html/js/flash for those 20 years.
Oh, actually, they didn't. In fact, with few exceptions, they have been rejected by users for most of those 20 years. The implementation was horrible. I don't know if it's better today - maybe it is for some Windows browsers. But no browser on my Mac or Linux supports it without an external install -- and last time I actually used it (~2 years ago), it still took forever to start applets.
It might have worked if the execution was acceptable; it's not impossible - flash had reasonable execution which lead to widespread adoption that is still nontrivial despite a big part of the web - that of mobile - made it unusable. And yet, 18 years later (I'm up-to-date as of 2 years ago), Java applets are still a mess.
So, the bottom line is: who cares the JVM ran in the browser?