scrollIntoView to apply to IFRAME only

Figured it out. I can set element's parent's scrollTop to element's own offsetTop. This will make parent scroll to element's position and effect will be local to IFRAME.

The above solution will indeed work but you wouldn't be able to apply smooth scrolling behaviour. Ran into the same issue and figured you can actually fix by using scrollTo, and then you'd be able to add a smooth scrolling.

Assuming container, and element are respectively the DOM elements for the fixed size container and the element you want to scroll to:

container.scrollTo({
    top: element.offsetTop,
    behavior: 'smooth',
  })

It's then up to you to choose whether you want to get the given DOM elements using jQuery or references.