seirdy.one/layouts/partials/webmention-form.html

<fieldset>
	<legend>Publish a response on your own website, and link back to this page's canonical location. Then share your link here to turn it into a Webmention.</legend>
	<form
		itemprop="potentialAction" itemscope="" itemtype="https://schema.org/CommentAction"
		action="https://seirdy.one/webmentions/receive" method="post">
		<meta itemprop="actionStatus" content="PotentialActionStatus" />
		{{ $canonicalRelPermalink := .RelPermalink | replaceRE "^/~seirdy/" "/" -}}
		<input type="hidden" name="target" value="{{ .Site.Params.canonicalBaseURL }}{{ $canonicalRelPermalink }}" />
		<label for="menchie">URL of page linking here</label>
		<div><!--We need the extra divs to serve as pseudo-table-cells.-->
			<input id="menchie" type="url" autocomplete="on" required="" name="source" /><!--enable autocomplete if the same URL mentions multiple pages.-->
			<div><input type="submit" value="submit" /></div>
		</div>
	</form>
</fieldset>