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dcbe6277bb
- Ensures that the browser can allocate the correct amount of space in the document while the image is loading. - Reduces CLS #499
37 lines
2.3 KiB
HTML
37 lines
2.3 KiB
HTML
{{- with .cxt}} {{/* Apply proper context from dict */}}
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{{- if (and .Params.cover.image (not $.isHidden)) }}
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{{- $alt := (.Params.cover.alt | default .Params.cover.caption | plainify) }}
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<figure class="entry-cover">
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{{- $addLink := (and .Site.Params.cover.linkFullImages (not $.IsHome)) }}
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{{- $cover := (.Page.Resources.ByType "image").GetMatch (printf "*%s*" (.Params.cover.image)) }}
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{{- if $cover -}}{{/* i.e it is present in page bundle */}}
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{{- if $addLink }}<a href="{{ (path.Join .RelPermalink .Params.cover.image) | absURL }}" target="_blank"
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rel="noopener noreferrer">{{ end -}}
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{{- $sizes := (slice "360" "480" "720" "1080" "1500") }}
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{{- $processableFormats := (slice "jpg" "jpeg" "png" "tif" "bmp" "gif") }}
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{{- $prod := (hugo.IsProduction | or (eq .Site.Params.env "production")) }}
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{{- if (and (in $processableFormats $cover.MediaType.SubType) (ne .Site.Params.cover.responsiveImages false) (eq $prod true)) }}
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<img loading="lazy" srcset="{{- range $size := $sizes -}}
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{{- if (ge $cover.Width $size) -}}
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{{ printf "%s %s" (($cover.Resize (printf "%sx" $size)).Permalink) (printf "%sw ," $size) -}}
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{{ end }}
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{{- end -}}{{$cover.Permalink }} {{printf "%dw" ($cover.Width)}}"
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sizes="(min-width: 768px) 720px, 100vw" src="{{ $cover.Permalink }}" alt="{{ $alt }}"
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width="{{ $cover.Width }}" height="{{ $cover.Height }}">
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{{- else }}{{/* Unprocessable image or responsive images disabled */}}
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<img loading="lazy" src="{{ (path.Join .RelPermalink .Params.cover.image) | absURL }}" alt="{{ $alt }}">
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{{- end }}
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{{- else }}{{/* For absolute urls and external links, no img processing here */}}
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{{- if $addLink }}<a href="{{ (.Params.cover.image) | absURL }}" target="_blank"
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rel="noopener noreferrer">{{ end -}}
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<img loading="lazy" src="{{ (.Params.cover.image) | absURL }}" alt="{{ $alt }}">
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{{- end }}
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{{- if $addLink }}</a>{{ end -}}
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{{/* Display Caption */}}
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{{- if not $.IsHome }}
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{{ with .Params.cover.caption }}<p>{{ . | markdownify }}</p>{{- end }}
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{{- end }}
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</figure>
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{{- end }}{{/* End image */}}
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{{- end -}}{{/* End context */ -}}
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