Make the HTML test look for deprecated elements and atributes

[marcusosterberg]

Feature/improvement

Quite similar to what is already present in the CSS test. To have the HTML test checking for deprecated and obsolete elements and atributes.

There is a source of these at MDN Web Docs:

• https://developer.mozilla.org/en-US/docs/Web/HTML/Element#obsolete_and_deprecated_elements
• https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes