See WPTs: imported/w3c/web-platform-tests/css/css-text/white-space/text-wrap-balance-float-001.html [ ImageOnlyFailure ] imported/w3c/web-platform-tests/css/css-text/white-space/text-wrap-balance-float-002.html [ ImageOnlyFailure ] imported/w3c/web-platform-tests/css/css-text/white-space/text-wrap-balance-float-003.html [ ImageOnlyFailure ] imported/w3c/web-platform-tests/css/css-text/white-space/text-wrap-balance-float-004.html [ ImageOnlyFailure ] imported/w3c/web-platform-tests/css/css-text/white-space/text-wrap-balance-float-005.html [ ImageOnlyFailure ]
<rdar://problem/117295008>
There is a Knuth-Plass based algorithm implemented at https://github.com/WebKit/WebKit/pull/16455 which might make it easier to support floats.