<!DOCTYPE html>
<title>HTMLScriptElement.supports speculationrules</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
test(() => {
  assert_true(HTMLScriptElement.supports('speculationrules'));
}, 'HTMLScriptElement.supports returns true for \'speculationrules\'');

test(() => {
  assert_false(HTMLScriptElement.supports(' speculationrules'));
  assert_false(HTMLScriptElement.supports('speculationrules '));
  assert_false(HTMLScriptElement.supports('Speculationrules'));
  assert_false(HTMLScriptElement.supports('SpeculationRules'));
  assert_false(HTMLScriptElement.supports('speculationRules'));
  assert_false(HTMLScriptElement.supports('speculation-rules'));
}, 'HTMLScriptElement.supports returns false for unsupported types');
</script>