User Story

As an user, I want not to use unsupported html5 tags in ZHTML so that browser won't alert any warning or errors.

Acceptance Criteria

Acronym, Big, Center, Dir, Font, isindex, Nobr, Param, Rtc, and Tt are all unsupppoted

Details

Refer https://developer.mozilla.org/en-US/docs/Web/HTML/Element