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**Do you want to request a *feature* or report a *bug*?**
Bug.

**What is the current behavior?**
`<embed>` doesn't trigger `onLoad`

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React. Paste the link to your JSFiddle (https://jsfiddle.net/Luktwrdm/) or CodeSandbox (https://codesandbox.io/s/new) example below:**

https://codesandbox.io/s/9yrqzw71xp

**What is the expected behavior?**
`<embed>` should trigger `onLoad`

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
16.8.6

track((domElement: any));
      ReactDOMInputPostMountWrapper(domElement, rawProps, true);
      break;
    case 'textarea':
      
      
      track((domElement: any));
      ReactDOMTextareaPostMountWrapper(domElement, rawProps);
      break;
    case 'select':
    case 'option':
       For input and textarea we current always set the value property at
       post mount to force it to diverge from attributes. However, for
       option and select we don't quite do the same thing and select
      
      
      break;
    default:
      if (typeof rawProps.onClick === 'function') {
        
        trapClickOnNonInteractiveElement(((domElement: any): HTMLElement));
      }
      break;
  }
  return updatePayload;
}
export function diffHydratedText(textNode: Text, text: string): boolean {
  const isDifferent = textNode.nodeValue !== text;
  return isDifferent;