[css-position-3] Spec that abspos/fixedpos forces an independent formatting context (as defined in css-display-3 currently). #7124

Author: fantasai

css-position-3/Overview.bs

@@ -295,9 +295,10 @@ Choosing A Positioning Scheme: 'position' property</h2>
 		</div>
 </dl>
 
-A 'position' value of ''position/absolute'' or ''position/fixed''
-[=blockifies=] the box
-and causes 'float' to compute to ''float/none''.
+	A 'position' value of ''position/absolute'' or ''position/fixed''
+	[=blockifies=] the box,
+	causes 'float' to compute to ''float/none'',
+	and forces the box to [=establish an independent formatting context=].
 
 <h3 id="def-cb">
 Containing Blocks of Positioned Boxes</h3>