Please note, this is a STATIC archive of website developer.mozilla.org from November 2016, cach3.com does not collect or store any user information, there is no "phishing" involved.
The HTML5 document state that the permitted content is flow content, not simply phrasing content (https://www.whatwg.org/specs/web-apps/current-work/multipage/tabular-data.html#the-td-element).