hidden-charset-case-sensitive.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-input-element/hidden-charset-case-sensitive.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<link rel="help" href="https://html.spec.whatwg.org/#hidden-state-(type=hidden):attr-fe-name-charset">

<meta name="assert" content="special input@name value “_charset_” is case-sensitive">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<form target="child" method="GET" action="hidden-charset-case-sensitive-child.html">

  <input type="hidden" name="_charset_">

  <input type="hidden" name="_CHARSET_">

  <input type="hidden" name="_ChArSeT_">

  <input type="hidden" name="_charſet_">

</form>

<iframe name="child"></iframe>

<script>

// #attr-fe-name-charset only affects form submission, so we need to do that

async_test(function() {

  // we use a message rather than the iframe’s load event to avoid dealing with

  // spurious load events that some browsers dispatch on the initial about:blank

  addEventListener("message", this.step_func_done(event => {

    const params = new URL(event.data).searchParams;

    assert_equals(params.get("_charset_"), "UTF-8", "lowercase valid");

    assert_equals(params.get("_CHARSET_"), "UTF-8", "uppercase valid");

    assert_equals(params.get("_ChArSeT_"), "UTF-8", "mixed case invalid");

    assert_equals(params.get("_charſet_"), "", "non-ASCII invalid");

  }));

  document.querySelector("form").submit();

}, "keyword _charset_");

</script>