What is event.preventDefault() in jQuery?

<form id="f"><button type="submit">Send</button></form>

$('#f').on('submit', function (e) {
  e.preventDefault();
  console.log('default prevented: ' + e.isDefaultPrevented());
});
$('#f').trigger('submit');

• preventDefault() stops the browser action.
• stopPropagation() stops the event going to the parents.
• return false in a jQuery handler does both.

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