diff --git a/cmd/wsh/cmd/wshcmd-setmeta.go b/cmd/wsh/cmd/wshcmd-setmeta.go
index 252319abc..88ff7b451 100644
--- a/cmd/wsh/cmd/wshcmd-setmeta.go
+++ b/cmd/wsh/cmd/wshcmd-setmeta.go
@@ -28,7 +28,7 @@ func init() {
 func parseMetaSets(metaSets []string) (map[string]interface{}, error) {
 	meta := make(map[string]interface{})
 	for _, metaSet := range metaSets {
-		fields := strings.Split(metaSet, "=")
+		fields := strings.SplitN(metaSet, "=", 2)
 		if len(fields) != 2 {
 			return nil, fmt.Errorf("invalid meta set: %q", metaSet)
 		}
diff --git a/frontend/app/app.tsx b/frontend/app/app.tsx
index 9f5c5da12..f06190020 100644
--- a/frontend/app/app.tsx
+++ b/frontend/app/app.tsx
@@ -172,6 +172,9 @@ function processBackgroundUrls(cssText: string): string {
                 hasJSUrl = true;
                 return;
             }
+            if (originalUrl.startsWith("data:")) {
+                return;
+            }
             const newUrl = encodeFileURL(originalUrl);
             node.value = newUrl;
         },