[cssom] Serialization of a declaration block not idempotent in presence of logical properties. #3244
Description
Testcase is:
<!doctype html>
<div id="test" style="margin-top: 10px; margin-block-start: 20px; margin-inline-start: 30px; margin-bottom: 40px; margin-left: 50px; margin-right: 60px"></div>
<pre>
<script>
document.writeln(test.style.cssText);
</script>
</pre>Which serializes to:
margin: 10px 60px 40px 50px; margin-block-start: 20px; margin-inline-start: 30px;
Which is not idempotent.