Whether HTML is a case sensitive or not is a general question asked in Web development interviews and the computer science MSQS.
If you are looking for the exact answer, keep reading a deep study done by one of our expert Programmers.
The correct answer to this question is:
HTML is a Case Sensitive or Not?
HTML is NOT a case sensitive language.
But if you are looking for a real reason why HTML is not a programming language, keep reading this blog.
What is HTML?
HTML stands for Hyper Text Markup language. One of the core technology to build the basic structure of a website. No matter how complicated and big a website you want to develop. You always start with HTML language.
Learning Case Sensitive Problem with the help of an Example
Human tends to learn better through example. Here is a real-life example that will help you to understand better.
As you can see, I have created the basic structure of an HTML document. The basic structure of an HTML page is also known as a Boilerplate.
The output will look like this:

Now, I am going to use some case sensitive words in HTML Tags. Does it affect the output?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title></title>
</head>
<BODY>
<H1> HTML is a Case Sensitive or Not?</h1>
</BODY>
</html>
After viewing the code in the browser, you can get the same output we got before. Even we use case sensitive words in HTML. That proves that unlike other languages like Javascript, Python, and C++, HTML is not a case-sensitive language.