From a4ea53f553bd26a9f08a9670ce2260df9182b141 Mon Sep 17 00:00:00 2001
From: James Berry <jb@jamesbe.com>
Date: Wed, 21 Apr 2021 23:19:45 +0100
Subject: [PATCH] fix: parse srcset attribute

---
 packages/virtual-dom/src/dom.ts | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/packages/virtual-dom/src/dom.ts b/packages/virtual-dom/src/dom.ts
index 2ee55ddb..bdba0079 100644
--- a/packages/virtual-dom/src/dom.ts
+++ b/packages/virtual-dom/src/dom.ts
@@ -60,9 +60,20 @@ export function setAttribute(node: HTMLElement, name: string, value: string | bo
     }
 
     // The srcset attribute specifies the URL of the image to use in different situations
-    if (name === 'srcset' || name === 'sizes') {
+    if (name === 'srcset') {
         const srcArray = value.split(',')
-        value = srcArray.map(src => completeAttrHref(src.trim(), node)).join(', ')
+        value = srcArray
+            .map(src => {
+                const [url, size] = src.trim().split(' ')
+                if (url && size) {
+                    return `${completeAttrHref(url, node)} ${size}`
+                }
+                if (url) {
+                    return completeAttrHref(url, node)
+                }
+                return ''
+            })
+            .join(', ')
         // decode uri
         value = decodeURIComponent(value)
     }