[css-cascade-5][editorial] Document issue with revert-layer in style attr

Author: mirisuzanne

css-cascade-5/Overview.bs

@@ -1857,6 +1857,22 @@ Rolling Back Cascade Layers: the ''revert-layer'' keyword</h4>
 	or between its [=normal=] and [=important=] levels in the [=cascade=]--
 	for this property on this element.
 
+	ISSUE: <a href="#style-attr">Element-attached styles</a> (i.e. style attribute declarations)
+	do not follow the sandwich rule for their normal and important levels,
+	so strictly interpreted a ''!important'' style attribute declaration
+	would revert the style attribute styles as well as all ''!important'' author-origin styles,
+	but <em>not</em> any of the other author-origin ''!important'' rules.
+	Is this what we want, or do we want something different?
+	See <a href="https://github.com/w3c/csswg-drafts/issues/6743#issuecomment-970669172">Issue 6743 discussion</a>.
+
+	<!-- replace text in note below with the following normative text if we want to not revert important author rules
+	For ''revert-layer'' in [=important=] <a href="#style-attr">element-attached styles</a>,
+	however,
+	it only reverts the <a href="#style-attr">element-attached styles</a>
+	and the intervening [=animation origin=],
+	and not any of the intervening [=author-origin=] [=important=] rules.
+	-->
+
 	Note: If there are no lower-priority declarations
 	in the same [=cascade origin=] as the ''revert-layer'' value,
 	the <a>cascaded value</a> will roll back to the previous origin.