hub.com/w3c/csswg-drafts/issues/3066
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  <meta name="assert" content="When the root element has a &lt;body&gt; child element, then the principal writing mode is instead taken from the values of 'writing-mode' and 'direction' on such first child element instead of taken from the root element. In this test, a small script verifies that the computed value of 'direction' of the root element itself is not affected by such propagation.">

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  This test *only* verifies the computed value of 'direction' o