‹table border=1›
  ‹!--  expression calculates colspan=2 --›
  ‹tr›‹td [attr.colspan]="1 + 1"›One-Two‹/td›‹/tr›

  ‹!-- ERROR: There is no `colspan` property to set!
    ‹tr›‹td colspan="{{1 + 1}}">Three-Four‹/td›‹/tr›
  --›

  ‹tr›‹td›Five‹/td›‹td›Six‹/td›‹/tr›
‹/table›