To include a shortcut, pass a parameter: {{Failed|WP:SHORT}}.
Failed proposals are categorized in Category:Wikipedia failed proposals.
When adding this template, it is recommended to provide links to any new proposals that superseded it, if known.
A failed proposal is one for which consensus for acceptance has not developed after a reasonable time period. Consensus need not be fully opposed; if consensus is neutral or unclear on the issue and unlikely to improve, the proposal has likewise failed.
It is not necessary or desirable to put this template on every page that has undergone a formal WP:PROPOSAL. Sometimes the proposal process identifies a better approach (e.g., that an informative and practical page should be a Help: page instead of a {{Guideline}}); these are in no way "failures" and tagging them as such might discourage editors from benefiting from the information on the page. In other cases, such as with the Wikipedia:BOLD, revert, discuss cycle page, editors prefer to retain an {{essay}} tag.
If you feel a need to document the existence of a prior proposal, consider putting a {{FAQ}} or generic {{tmbox}} note on the talk page.
{{Failed|shortcut}}
The first unnamed parameter (or named as |1=) is optional. If supplied, it displays as a link to the appropriate shortcut page for the proposal. (Note that this is not automatic; MediaWiki cannot determine the shortcut from the page itself. You need to discover or create the shortcut yourself.) Please do not create shortcuts for failed proposals; intelligible shortcuts are a finite resource. In fact, shortcuts may be usurped from long-failed proposals to redirect to something active.
The |date= parameter can be used to add the date at which the page was tagged as failed, or at which a formal WP:PROPOSAL process did not accept the proposal. It accepts any valid date format.
A |result= AKA |reason= parameter can also be used to add free-form text explaining the failure (e.g. linking to a WP:PROPOSAL discussion, quoting from an RfC summary statement, etc.). This should be kept short (e.g., a concise sentence or two), since this is a banner template. The content of this parameter will be auto-formatted as a separate paragraph below the default text (and thus should not itself contain paragraph markup).
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{{No consensus}}{{Rejected}}