Validator start immediately when page displays?

[pc leung]

When the first time the web page displays,
the validator hightlights fields which are blank.
However submit button is not clicked yet.
 Instead of hightlighting errors at the first time of web page displays,
can the errors be shown up after the submit button is clicked?
  (My web page has a tile component. I do not know if it is part of the
reason).
 thanks