{{ $marginnoteDomIdSuffix := .Ordinal }}
<label for="marginnote-{{.Page.File.UniqueID}}-{{ $marginnoteDomIdSuffix }}">
class="margin-toggle">⊕
</label>
<input type="checkbox" id="marginnote-{{.Page.File.UniqueID}}-{{ $marginnoteDomIdSuffix }}" class="margin-toggle" />
<span class="marginnote">{{ .Inner }}</span>