What does this mean which is in note in attribute section?

Question

The align attribute of <p> is not supported in HTML5.

Answer 1

It means, if the document is HTML5 standard, and you use the 'align' attribute with the paragraph <p> tag, it *may not* affect how the paragraph is aligned in the browser view area.

However, as I tried it in Code Playground the 'align' attribute still affected the paragraph's alignment.

<p align="center">This is a paragraph</p>