title: Two iframes side by side, left one is a sidebar with links that would open in the right iframe
body: <p>What is the best practice for HTML with two iframes side by side, when the left one is a sidebar that contains links which will open other html pages on the right iframe when clicking on them?</p>
  
  <p>Something like that:
  <a href="https://i.stack.imgur.com/opSni.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/opSni.png" alt="enter image description here"></a></p>