half-size img

layouts/shortcodes/img.html

@@ -15,6 +15,8 @@ care about is 700*4=2800px.
 {{ $j1400 := $src.Resize "1400x" }}
 {{ $j2800 := $src.Resize "2800x" }}
 
+{{ $width := cond (eq (.Get "half") "true") "350px" "700px" }}
+
 {{ with .Get "hint" }}
 {{ else }}
   {{ errorf "missing value for param 'hint': %s" .Position }}
@@ -29,7 +31,7 @@ care about is 700*4=2800px.
     {{ with .Get "link" }}<a href="{{ . }}">{{ end }}
     <picture>
       <source type="image/webp"
-        sizes="(max-width: 600px) 350px, 700px"
+        sizes="(max-width: 600px) 350px, {{ $width }}"
         srcset='
         {{- if ge $src.Width "350" }}
           {{ with $w350.RelPermalink }}{{.}} 350w{{ end }}