#JC-1725 fix w3c errors in banner tag
#JC-1721 removed Close tags button. fix preview in PM
Merge branch 'JC-1725.w3c_errors' into JC-1522.remove_hotkey_from_preview
Merge branch 'JC-1721.remove_close_tags_button' into JC-1522.remove_hotkey_from_preview
#JC-1522 fix visibility