Hello I have reviewed the html code and I would like to suggest to add a few line of comments at the beginning of the code as well as add the comments in the code and here are the points that we should keep in mind:

Why you wrote a particular function or other code block
What task the code block is supposed to perform
Who requested the code block
Why you used a particular technique for writing the code block
Which resources you used to create the code
How the code was created and tested
Who worked on the code (including contact information)
When the code was created

Source: Mueller, John Paul. "Chapter 3 - Integrating HTML5 and JavaScript". HTML5 Programming with JavaScript For Dummies. John Wiley & Sons.

I edited the file to include comments.