[css-page] Add JIS-B4 and JIS-B5

Author: frivoal

css-page/Overview.bs

@@ -1789,6 +1789,12 @@ Page size: the 'size' property</h3>
 				<dt><dfn>B4</dfn>
 				<dd>Equivalent to the size of ISO B4 media: 250mm wide by 353mm high.
 
+				<dt><dfn>JIS-B5</dfn>
+				<dd>Equivalent to the size of JIS B5 media: 182mm wide by 257mm high.
+
+				<dt><dfn>JIS-B4</dfn>
+				<dd>Equivalent to the size of JIS B4 media: 257mm wide by 364mm high.
+
 				<dt><dfn>letter</dfn>
 				<dd>Equivalent to the size of North American letter media: 8.5 inches wide and 11 inches high
 
@@ -2415,6 +2421,7 @@ Changes</h2>
 	<ul>
 		<li>Imported the 'marks' and 'bleed' properties from [[CSS3GCPM]].
 		<li>Added ''bleed/auto'' as the initial value of 'bleed' and allowed it to apply even when 'marks' is ''none''.
+		<li>Added JIS-B4 and JIS-B5
 	</ul>
 
 <h2 class="no-num" id="acknowledgements">Acknowledgements</h2>