hugo-theme-stack-stars/layouts/partials/article/components/header.html

<header class="article-header">
    {{ if .Params.image }}
    {{- $image := partial "helper/image" . -}}

    {{- $tablet := $image.Resize "1024x" -}}
    {{- $desktop := $image.Resize "2000x" -}}

    <div class="article-image">
        <img srcset="{{ $tablet.RelPermalink }} 1024w, {{ $desktop.RelPermalink }} 2000w"
            src="{{ $desktop.RelPermalink }}" width="{{ $image.Width }}" height="{{ $image.Height }}"
            loading="lazy"
            alt="Featured image of post {{ .Title }}" />
    </div>
    {{ end }}

    {{ partial "article/components/details" . }}
</header>