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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/media-elements/interfaces/HTMLElement/HTMLTrackElement/default.html 

<!doctype html>
<title>HTMLTrackElement.default</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id=log></div>
<script>
test(function(){
    var track = document.createElement('track');
    assert_equals(track['default'], false);
    assert_equals(track.getAttribute('default'), null);
}, document.title + ' missing value');

test(function(){
    var track = document.createElement('track');
    track.setAttribute('default', '');
    assert_equals(track['default'], true);
    assert_equals(track.getAttribute('default'), '');
}, document.title + ' empty string content attribute');

test(function(){
    var track = document.createElement('track');
    track['default'] = '';
    assert_equals(track['default'], false);
    assert_equals(track.getAttribute('default'), null);
}, document.title + ' empty string IDL attribute');

test(function(){
    var track = document.createElement('track');
    track.setAttribute('default', 'foo');
    assert_equals(track['default'], true);
    assert_equals(track.getAttribute('default'), 'foo');
}, document.title + ' foo in content attribute');

test(function(){
    var track = document.createElement('track');
    track['default'] = 'foo';
    assert_equals(track['default'], true);
    assert_equals(track.getAttribute('default'), '');
}, document.title + ' foo in IDL attribute');

test(function(){
    var track = document.createElement('track');
    track['default'] = true;
    assert_equals(track['default'], true);
    assert_equals(track.getAttribute('default'), '');
}, document.title + ' true in IDL attribute');

test(function(){
    var track = document.createElement('track');
    track.setAttribute('default', '');
    track['default'] = false;
    assert_equals(track['default'], false);
    assert_equals(track.getAttribute('default'), null);
}, document.title + ' false in IDL attribute');
</script>