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chromium/third_party/blink/web_tests/external/wpt/html/semantics/forms/the-option-element/option-text-backslash.html 

<!doctype html>
<meta charset=EUC-JP>
<title>Test for the backslash sign in option.text</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<select id=test><option>\</option></select>
<script>
test(function() {
  var select = document.getElementById("test");
  var option = select.firstChild;
  assert_equals(option.text, "\\");
  assert_equals(option.textContent, "\\");
});
</script>