snek-tech-blog/layouts/shortcodes/hover.html

{{ if .IsNamedParams }}
  <span class="tooltip">{{ .Inner }}
    <span class="tooltiptext">{{ .Get "hover-text" }}</span>
  </span>
{{ else }}
  <span class="tooltip">{{ .Inner }}
    <span class="tooltiptext">{{ .Get 0 }}</span>
  </span>&nbsp;
{{ end }}