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<!DOCTYPE html>
<html>
<body>
<p>A form with a search field that CANNOT contain the following characters: ' or "</p>
<form action="/action_page.php">
  Search: <input type="search" id="mySearch" name="search" pattern="[^'\x22]+" title="Invalid input">
  <input type="submit">
</form>
<p>Click the "Try it" button to display the value of the pattern attribute of the search field.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("mySearch").pattern;
  document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>