get-non-ascii-text-plain-latin-1.html

<meta charset="iso-8859-1">
<body onload="test()">
<form method="get" enctype="text/plain" action="mailto:[email protected]">
<input type="text" size="10" maxlength="40" name="subject" value="Fr&egrave;re Fran&ccedil;ois">
<input type="text" size="10" maxlength="40" name="body" value="&#1055;&#1088;&#1086;&#1074;&#1077;&#1088;&#1082;&#1072;">
<input type="submit" value="Send">
</form>
<script>
function test() {
  if (window.testRunner) {
    testRunner.dumpAsText();
    testRunner.waitForPolicyDelegate();
    document.getElementsByTagName("form")[0].submit();
  }
}
</script>

chromium/third_party/blink/web_tests/fast/forms/mailto/get-non-ascii-text-plain-latin-1.html