how's <div id=float-box></div><span id=no-wrap>should not wrap</span> any different from <div id=float-box></div><div id=no-wrap>should not wrap</div> (where the float box is intrusive to IFC) afaict, in neither case the line has wrap opportunity and yet the first case wraps at <span>.
<rdar://problem/100124469>
Test gardening commit 267514@main (f3e388e446c4): <https://commits.webkit.org/267514@main> Reviewed commits have been landed. Closing PR #17294 and removing active labels.