How to save data from html

Question

I want to create a "website" which memories and calculate my marks
How to save date from cell and you after.
Example:
I open HTML file in browser
Enter date and Mark
Exit from file (how to add auto save option)
When I open again data isn't lost

Answer 1

Depending on how much you need to be saved, the answer could be as simple as a couple cookies. However, I would personally prefer some type of database for it. Firebase is extremely simple to use, and free

Answer 2

Use LocalStorage

Eg:

var x="Your String";
localStorage.userVariable=x;

During re-open
Check

window.onload=function(){
var restore;
If(localStorage && localStorage.userVariable){
restore=localStorage.userVariable;
}
}

(*userVariable - which is defined by user)

Usage of if statement:
If((Statement check the browser compatibility) && (checking the user data))