How to set HTML content into an iframe

Question

I have a HTML string

  Hello world
 

and I wan

Answer 1

I have a problem with 'origin' with the answers here. This is how it's work for me:

const frame1 = document.createElement('iframe');
frame1.name = 'frame1';
//not have to set this style,just for demo
frame1.style.position = 'absolute';
frame1.style.height = '800px';
frame1.style.top = '100px';
frame1.style.left = '100px';
frame1.style.background = 'white';

document.body.appendChild(frame1);
const frameDoc =
  frame1.contentWindow || frame1.contentDocument.document || 
  frame1.contentDocument;

frameDoc.document.write('Hello world');
frameDoc.document.close();