This is a legacy, unprefixed Confluence bridge for the Anchor macro. Please use the XWiki id macro instead.
A converter now converts anchor to id directly during Confluence migrations.
Example
Anchor "test"
{{anchor name="test" /}}
Scroll down to see a link to the anchor:
Link to the anchor
If you have scrolled in this window, this link should bring you back at the top of the document.
Link to the anchor: link