IDs are anchors

I may be the only one who didn't know this, beings I don't keep up with the fast-moving world of markup to the degree I used to, but I just learned yesterday from Design by Fire's excellent Jakob Nielsen makeover that "id=" attributes in HTML can be treated as anchors (like <a name> tags).

Thusly: #profile-container.


Reminds me of another idea I (and others) had once, regarding arbitrarily linking to different parts of a page. But it's not quite the same.