Replacing named anchor with id attribute on element?

[barbaz]

Currently (at least in SeaMonkey) it's possible to use the id attribute of an element for same purpose as

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<a name="...">

For example, to scroll to a point "foo" in a page, the following appears equivalent:

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<a name="foo"></a>
<div>blah blah content</div>

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<div id="foo">blah blah content</div>

Either way, can click a link like this

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<a href="#foo">link</a>

and end up scrolled to the blah blah content.

How stable is that behavior / how much can I rely on it being there? Is this a browser quirk or standard behavior?
I discovered it by accident and can't find anything about it on MDN nor the WHATWG standards.

Thanks