Lazily loaded frames should still get a contentWindow/contentDocument as soon as they get inserted into the document. Currently, we return null for these until the iframe moves to the viewport and gets loaded. This behavior is inconsistent with Chrome and recently caused breakage on https://www.kongregate.com (Bug 252636).
Pull request: https://github.com/WebKit/WebKit/pull/10521
Committed 260713@main (96e0c1e9f533): <https://commits.webkit.org/260713@main> Reviewed commits have been landed. Closing PR #10521 and removing active labels.
<rdar://problem/105806238>