The main problem related to HTML empty characters is that they can cause unexpected behavior in web browsers. Empty characters are invisible characters that are inserted into the HTML code, such as spaces, tabs, and line breaks. These characters can cause issues with formatting and spacing of elements on a page, as well as interfere with the proper display of content. Additionally, empty characters can cause problems when parsing HTML documents and can lead to unexpected results when manipulating the DOM (Document Object Model).
​
1. let x = 5;
– This line of code declares a variable called ‘x’ and assigns it the value of 5.
2. let y = 10;
– This line of code declares a variable called ‘y’ and assigns it the value of 10.
3. let z = x + y;
– This line of code declares a variable called ‘z’ and assigns it the value of the sum of x and y (5 + 10).
What is  
is an HTML entity that stands for “non-breaking space.” It is used to create extra space between words or letters without creating a new line. This can be useful when formatting text, such as in titles or headings.
How do you write nothing in HTML
You can write nothing in HTML by using the comment tag: