[css-inline-3] Add note about how float/position block applicability of initial-letter. #688

Author: fantasai

css-inline-3/Overview.bs

@@ -514,7 +514,7 @@ Creating Initial Letters: the 'initial-letters' property</h3>
 		<pre>p::first-letter { initial-letters: 2; }</pre>
 	</div>
 
-<h4 id="first-most-inline-leve">
+<h4 id="first-most-inline-level">
 Applicability</h4>
 
 	To give authors more control over which characters can be styled as an <a>initial letter</a>
@@ -572,6 +572,10 @@ Applicability</h4>
 	its <a>used value</a> is ''initial-letters/normal'',
 	and it is not formatted as an <a>initial letter</a>.
 
+	Note: The 'initial-letters' property cannot apply to any element
+	whose 'float' is not ''float/none'' or 'position' is not ''static'',
+	because these values cause its 'display' to compute to ''block''.
+
 	The effect of the 'initial-letters' property is undefined
 	on children of <a>ruby</a> base container boxes
 	and on <a>ruby</a> container boxes.