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https://github.com/servo/servo
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29 lines
1.1 KiB
HTML
29 lines
1.1 KiB
HTML
<!DOCTYPE html>
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<title>dataset: should return 'undefined' for non-existent properties</title>
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<link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<div id="log"></div>
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<script>
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var div = document.createElement("div");
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test(function() {
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assert_false("foo" in div.dataset);
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assert_equals(div.dataset.foo, undefined);
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}, "Should return 'undefined' before setting an attribute")
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test(function() {
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div.setAttribute("data-foo", "value");
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assert_true("foo" in div.dataset);
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assert_equals(div.dataset.foo, "value");
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}, "Should return 'value' if that's the value")
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test(function() {
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div.setAttribute("data-foo", "");
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assert_true("foo" in div.dataset);
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assert_equals(div.dataset.foo, "");
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}, "Should return the empty string if that's the value")
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test(function() {
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div.removeAttribute("data-foo");
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assert_false("foo" in div.dataset);
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assert_equals(div.dataset.foo, undefined);
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}, "Should return 'undefined' after removing an attribute")
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</script>
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