File: input-pattern-dynamic-value.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Pattern dynamic value attribute change</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1636495">
<input pattern="a" value="a">
<script>
test(function() {
  let i = document.querySelector("input");
  assert_false(i.matches(":invalid"));
  i.pattern = "b";
  assert_true(i.matches(":invalid"));
  i.pattern = "(";
  assert_false(i.matches(":invalid"));
}, "input validation is updated after pattern attribute change");
</script>