Ticket #59989: 59989.patch

wp-content/themes/twentyfifteen/css/editor-style.css

@@ -298 +298 @@
 .mce-item-table td {
         border-width: 0 1px 1px 0;
         font-family: "Noto Serif", serif;
-        font-size: 17px;
         padding: 7px;
         vertical-align: baseline;
 }