Hidden: Specified new behavior

Closes gh-737

Author: AurelioDeRosa

entries/hidden-selector.xml

@@ -18,6 +18,7 @@
     <p>Elements that are not in a document are not considered to be visible; jQuery does not have a way to know if they will be visible when appended to a document since it depends on the applicable styles.</p>
     <p>During animations to show an element, the element is considered to be visible at the start of the animation.</p>
     <p>How <code>:hidden</code> is determined was changed in jQuery 1.3.2. An element is assumed to be hidden if it or any of its parents consumes no space in the document. CSS visibility isn't taken into account (therefore <code>$( elem ).css( "visibility", "hidden" ).is( ":hidden" ) == false</code>). The <a href="http://blog.jquery.com/2009/02/20/jquery-1-3-2-released/">release notes</a> outline the changes in more detail.</p>
+    <p>jQuery 3 slightly modifies the meaning of <code>:hidden</code> (and therefore of <a href="/visible-selector/"><code>:visible</code></a>). Starting with this version, elements will be considered <code>:hidden</code> if they don't have any layout boxes. For example, <code>br</code> elements and inline elements with no content will not be selected by the <code>:hidden</code> selector.</p>
   </longdesc>
   <note id="jquery-selector-extension" type="additional" data-selector=":hidden"/>
   <note id="hidden-forces-layout" type="additional"/>