Steps to reproduce: 1. Open https://jsbin.com/qubivebiju/edit?html,output 2. Wait one second. Expected behavior: The text "12" is shown. Actual behavior: Only "1" is shown. "2" exists on DOM, but not visible. As it seems a paint invalidation issue, "2" will appear on selection.
Created attachment 465777 [details] Patch
Created attachment 465779 [details] Patch
<rdar://problem/107694159>
Created attachment 465797 [details] Patch
Committed 262674@main (63e18b5e9ecd): <https://commits.webkit.org/262674@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 465797 [details].