Various tweaks to make Chrome packaged apps run smoothly

src/supports/focus-in-hidden-iframe.js

@@ -23,7 +23,8 @@ export default memorizeResult(() => detectFocus({
 
     // writing the iframe's content is synchronous
     _document.open();
-    _document.write('<input>');
+    const input = _document.createElement('input');
+    _document.body.appendChild(input);
     _document.close();
 
     return _document.querySelector('input');

src/supports/media/svg.js

@@ -1,4 +1,2 @@
 
-export default 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtb'
-  + 'G5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiBpZD0ic3ZnIj48dGV4dCB4PSIxMCIgeT0iMjAiIGlkPSJ'
-  + 'zdmctbGluay10ZXh0Ij50ZXh0PC90ZXh0Pjwvc3ZnPg==';
+export default '';

src/supports/supports-cache.js

@@ -12,39 +12,15 @@ function readLocalStorage(key) {
   // allow reading from storage to retrieve previous support results
   // even while the document does not have focus
   let data;
-
-  try {
-    data = window.localStorage && window.localStorage.getItem(key);
-    data = data ? JSON.parse(data) : {};
-  } catch (e) {
-    data = {};
-  }
-
+  data = {};
   return data;
 }
 
 function writeLocalStorage(key, value) {
-  if (!document.hasFocus()) {
-    // if the document does not have focus when tests are executed, focus() may
-    // not be handled properly and events may not be dispatched immediately.
-    // This can happen when a document is reloaded while Developer Tools have focus.
-    try {
-      window.localStorage && window.localStorage.removeItem(key);
-    } catch (e) {
-      // ignore
-    }
-
-    return;
-  }
-
-  try {
-    window.localStorage && window.localStorage.setItem(key, JSON.stringify(value));
-  } catch (e) {
-    // ignore
-  }
+  return
 }
 
-const userAgent = typeof window !== 'undefined' && window.navigator.userAgent || '';
+const userAgent = '';
 const cacheKey = 'ally-supports-cache';
 let cache = readLocalStorage(cacheKey);