Why do I need to override the handle_data method in my own class?

Question

Why do I need to override the handle_data() method when it already exists in the library here: https://docs.python.org/3/library/html.parser.html#html.parser.HTMLParser

This answer explains that the default behaviour of handle_data() is nothing, but I don't understand how that can be: Python overidable functions from HTMLParser

from html.parser import HTMLParser
class MyHTMLParser(HTMLParser):
    # Why does this not work?
    # test = HTMLParser.handle_data(self, data)
    # print(test)

    #Why do I need to define handle_data() when it already exists in the library?
    def handle_data(self, data):
        print(data)

URL = "https://en.wikipedia.org/wiki/Data_science"
text = requests.get(URL).content.decode('utf-8')
parser = MyHTMLParser()
parser.feed(text)