This test verifies that an anchor with only a tagId will produce the proper id. Anchor with only the tagId set, no href or action, etc., produce an anchor that can be used as a location for navigating inside of the page. Another anchor can set the linkName attribute to produce a fragment identifier which targets the first anchor.
Because the tagId is scoped, the linkName should also be scoped. An anchor with only a tagId will produce a name attribute, but this is not added to the name table. The reason for this, is that the name written for backward compatbility with old browsers.