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<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<div id='testElem'></div>
<script>
test(function() {
assert_equals(testElem.getAttribute('style'), null);
testElem.style.setProperty('--foo', 'first');
assert_equals(testElem.style.getPropertyValue('--foo'), 'first');
assert_equals(getComputedStyle(testElem).getPropertyValue('--foo'), 'first');
assert_equals(testElem.getAttribute('style'), '--foo:first;');
testElem.style.setProperty('--foo', 'second');
assert_equals(testElem.style.getPropertyValue('--foo'), 'second');
assert_equals(testElem.getAttribute('style'), '--foo:second;');
}, "subsequent writes to inline style overwrite older values.")
</script>
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