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

<!doctype html>
<meta charset=utf-8>
<title>HTMLOptionElement.text</title>
<link rel=author title=Ms2ger href="mailto:[email protected]">
<link rel=help href="https://html.spec.whatwg.org/multipage/#dom-option-text">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
test(function() {
  var spaces = ["\u0020", "\u0009", "\u000A", "\u000C", "\u000D"];
  spaces.forEach(function(space) {
    test(function() {
      var option = document.createElement("option");
      option.textContent = space + "text";
      assert_equals(option.text, "text");
    }, "option.text should strip leading space characters (" +
        format_value(space) + ")");
  });
  spaces.forEach(function(space) {
    test(function() {
      var option = document.createElement("option");
      option.textContent = "text" + space;
      assert_equals(option.text, "text");
    }, "option.text should strip trailing space characters (" +
        format_value(space) + ")");
  });
  spaces.forEach(function(space) {
    test(function() {
      var option = document.createElement("option");
      option.textContent = space + "text" + space;
      assert_equals(option.text, "text");
    }, "option.text should strip leading and trailing space characters (" +
        format_value(space) + ")");
  });
  spaces.forEach(function(space) {
    test(function() {
      var option = document.createElement("option");
      option.textContent = "before" + space + "after";
      assert_equals(option.text, "before after");
    }, "option.text should replace single internal space characters (" +
        format_value(space) + ")");
  });
  spaces.forEach(function(space1) {
    spaces.forEach(function(space2) {
      test(function() {
        var option = document.createElement("option");
        option.textContent = "before" + space1 + space2 + "after";
        assert_equals(option.text, "before after");
      }, "option.text should replace multiple internal space characters (" +
          format_value(space1) + ", " + format_value(space2) + ")");
    });
  });
  test(function() {
    var option = document.createElement("option");
    option.textContent = "\u00a0text";
    assert_equals(option.text, "\u00a0text");
  }, "option.text should leave leading NBSP alone.");
  test(function() {
    var option = document.createElement("option");
    option.textContent = "text\u00a0";
    assert_equals(option.text, "text\u00a0");
  }, "option.text should leave trailing NBSP alone.");
  test(function() {
    var option = document.createElement("option");
    option.textContent = "before\u00a0after";
    assert_equals(option.text, "before\u00a0after");
  }, "option.text should leave a single internal NBSP alone.");
  test(function() {
    var option = document.createElement("option");
    option.textContent = "before\u00a0\u00a0after";
    assert_equals(option.text, "before\u00a0\u00a0after");
  }, "option.text should leave two internal NBSPs alone.");
});
</script>