Why html is not programming language ?

Answer 1

Because it's a Markup language.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://stackoverflow.com/questions/145176/is-html-considered-a-programming-language&ved=0ahUKEwjA6P7RzuLbAhXMJJoKHViKCyYQFgglMAE&usg=AOvVaw310XqTWJW9BcCZP8dR_8aK

Answer 2

HTML is a markup language, as you can use it to make the structure of a web page, bit you need to actually use JavaScript to make stuff happen when you click a button, or for making a game.