Richman

here my business website codebox24 .000webhostapp.com 

Here for apply some changes Try editor

Here the feature for Tryit engine checking correct or wrong can be also upgrade or improve not exactly like that might be in real time as you type

Here the Horizontal Layout Design

Here the feature to add to TRY IT ENGINE see below pic

This features combines to imrove Try it engine as Suggestion N1 mentioned should have two columns Layout design first and the functionality feature is to repeat the exercise in the first column. So below see features one by one,

Here is new suggestion to imrove the Tryit engine with Exercise v3.0 features like below see pics,

another example of code editor see below

here some ideas to improve from other web services below see the pic

another textarea should be beside for perfect typing and output as placeholder text

here the suggestion for Tryit Editor below pic see 

Hello! Good day!

Actually best service this w3schools website in terms of teaching and training but exercise engine need a feature for redo and repeat exercise. So coming to suggestion that can crazy improve this service a lot by doing Tryit engine more like (codegym.cc exercise repeat code section ), practice mean more coding with interactivity learning from mistake and trying again.

thanks with regards,