You can now try this Character LCD emulator in your browser. Here are a couple of live demos:

Hello World! 16x2 character LCD demo. Just type into the character LCD using your keyboard. https://visrealm.github.io/vrEmuLcd/examples/helloworld

For a deeper dive into the character LCD interface, you can try this reproduction of David Murray's character LCD project box. TO use this demo, you will need to know how some of the commands work. Flick the switches to input a byte of data at a time to either the instruction or data register of the display. https://visrealm.github.io/vrEmuLcd/examples/8bitguy