HTML—the Most Difficult Programming Language in the World
October 13, 2025
Years ago, the web development community discussed and declared on Twitter that HTML was not just a document language, but a programming language.Meanwhile, virtually no HTML page is error-free. In HTML parlance, almost no page is conformant, compliant, valid, or “validates.” (Cf. validation data from 2021 through 2025.)
Source: HTML—the Most Difficult Programming Language in the World · Jens Oliver Meiert
It’s a relatively simple syllogism:
1. HTML is a programming language (as many believe, certainly I do).
2. Essentially, no HTML document is without errors.
3. Therefore, HTML is the most difficult programming language in the world.
