Can you still play Runescape in an internet browser?

I was attempting to play Runescape through a browser, but I got a message saying it would not work with my Mac OS specs (it needs Windows and Internet explorer). After downloading a Windows 10 VM and trying with a browser, I was still unable to get Runescape to be playable in a browser.

How can I play Runescape through a browser, if it is still possible?

Contrary to the official website and comments in response to the OP, there has been no way to play the current version of RuneScape in the browser for around six months now.

Since 2016, Jagex had been pushing their new native client. Both clients were previously available for download at the same time, but in November of 2019, the links to the Java client were removed and only accessible had you done some digging. A month later, though, in December, the Java-based client was completely discontinued. And, due to protocol changes, previously downloaded versions of the client no longer work either.

With the discontinuation of the JavaScript-based client, the Java applet had been the only remaining version of the game playable in the browser.