What is this?
Don't be scared. This is just a side-by-side display of code written on the left side and the actual program on the right side.
If you're familiar with one of the most popular games, Pokemon, you can see that on the "Pokemon Info Search", you can enter a name of any Pokemon that exists and this program will find information about it instantly!
You can interact with it yourself below!
On the code bar (left side), you can click between "HTML", "CSS", and "JS" to see the different type of code used to create this display screen on the right side.
Hope you enjoyed!