Ensure an accessible default viewport meta tag (#10823)

* fix: remove minimum-scale from default viewport

* update test

* remove extra comma

* drop initial-scale

packages/next/next-server/lib/head.tsx

@@ -11,12 +11,7 @@ type WithInAmpMode = {
 export function defaultHead(inAmpMode = false) {
   const head = [<meta charSet="utf-8" />]
   if (!inAmpMode) {
-    head.push(
-      <meta
-        name="viewport"
-        content="width=device-width,minimum-scale=1,initial-scale=1"
-      />
-    )
+    head.push(<meta name="viewport" content="width=device-width" />)
   }
   return head
 }

test/integration/client-navigation/test/rendering.js

@@ -52,7 +52,7 @@ export default function(render, fetch) {
     test('header renders default viewport', async () => {
       const html = await render('/default-head')
       expect(html).toContain(
-        '<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1"/>'
+        '<meta name="viewport" content="width=device-width"/>'
       )
     })