File: lone-surrogates.sub.html

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<!doctype html>
<meta charset={{GET[encoding]}}> <!-- ends up as <meta charset> by default which is windows-1252 -->
<meta name=variant content="?encoding=windows-1252">
<meta name=variant content="?encoding=utf8">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
function expected(encoding) {
  return "?" + {
    // Replacement character (not bogus UTF-8)
    "UTF-8": "%EF%BF%BD",
    // Charref for the replacement character (not the lone surrogate)
    "windows-1252": "%26%2365533%3B",
  }[encoding];
}

test(t => {
  const elm = document.createElement("a");
  document.body.appendChild(elm);
  t.add_cleanup(() => elm.remove());
  elm.setAttribute("href", "?\uD800");

  const shouldEndWith = expected(document.characterSet);
  assert_true(
    elm.href.endsWith(shouldEndWith),
    `${elm.href} did not end with ${shouldEndWith}`
  );
}, `Query parsing with lone surrogates in ${document.characterSet}`);
</script>