are ads allowed in iframes?

window.document.getElementById(‘post-3845’).parentNode.className += ‘ adhesive_post’;Hello
as the title says "are ads allowed in iframes" i could see frm some network TOS tht the page should have some content..but in an iframe just the ad and no content is it illegal?
How will the script check out… my content in the main page and show relevant ads

Original post by uniaxaj