On the old board, we agreed to quote both the web address as well as relevant wording when we respond to queries.  The logic behind this is simple: web pages disappear and sometimes valuable resources are lost when the linked page has disappeared.  The quoted words may be many or few, but either way it’s helpful for future reference.  Could we do this again, please?

Sometimes it is not really appropriate, e.g. if your point is not encapsulated by a simple quote but instead is made by the whole article.

But sometimes it is.

Yes.

Extra characters to make the submission work.

I agree with eliza that this is best practice. One should always excerpt the most relevant information to ensure that the post remains useful even if the link should die.