{{- $src := .Get "src" -}}
{{- $caption := .Get "caption" | default "" -}}
{{- $alt := .Get "alt" | default $caption -}}
<figure>
  <img src="{{ $src }}" alt="{{ $alt }}" style="max-width:100%; border-radius:4px;" />
  {{- if $caption }}<figcaption>{{ $caption }}</figcaption>{{ end -}}
</figure>