I’m so excited about this, I had to try it myself—Jason Scott announced that the Internet Archive now supports embedding playable games and other software from their collections in web pages. (Look for the share icon on any software page.)
For example, here’s Pitfall for the Atari 2600:
Sonic for the Sega Genesis:
And Maniac Mansion for MS-DOS:
Want more? Dig into the Console Living Room, MS-DOS Collections, and Software Library.
Sonic was a great game you should add outrun another amazing game back in the day.