Bug 397 – Change the rules for the handling of dimension attributes so that the requirement that they keep their ratio takes into account the integer nature of the attributes.

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Bug 397 - Change the rules for the handling of dimension attributes so that the requirement that they keep their ratio takes into account the integer nature of the attributes.


Summary:	Change the rules for the handling of dimension attributes so that the require...

Status:	NEW

Product:	Validator.nu
Classification:	Unclassified
Component:	General
Version:	HEAD
Hardware:	All All

Importance:	P2 normal
Assigned To:	Nobody

URL:	http://svn.whatwg.org/webapps/source?...

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2009-01-04 16:49 CET by Henri Sivonen
Modified:	2009-11-23 17:17 CET (History)
CC List:	0 users

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Description Henri Sivonen 2009-01-04 16:49:23 CET

Index: source
===================================================================
--- source	(revision 2473)
+++ source	(revision 2474)
@@ -23468,13 +23468,34 @@
   resolution that differs from the CSS pixel resolution. (On screens,
   CSS pixels have a resolution of 96ppi, but in general the CSS pixel
   resolution depends on the reading distance.) If both attributes are
-  specified, then the ratio of the specified width to the specified
-  height must be the same as the ratio of the intrinsic width to the
-  intrinsic height in the resource, or alternatively, in the case of
-  the <code>video</code> element, the same as the <span
-  title="concept-video-adjusted-ratio">adjusted ratio</span>. The two
-  attributes must be omitted if the resource in question does not have
-  both an intrinsic width and an intrinsic height.</p>
+  specified, then one of the following statements must be true:</p>
+
+  <ul>
+
+   <li><span><var title="">specified width</var> - 0.5 &le;
+             <var title="">specified height</var> * <var title="">target ratio</var> &le;
+             <var title="">specified width</var> + 0.5</span></li>
+
+   <li><span><var title="">specified height</var> - 0.5 &le;
+             <var title="">specified width</var> / <var title="">target ratio</var> &le;
+             <var title="">specified height</var> + 0.5</span></li>
+
+  </ul>
+
+  <p>The <var title="">target ratio</var> is, in the
+  <code>video</code> element, the same as the <span
+  title="concept-video-adjusted-ratio">adjusted ratio</span>, and in
+  the other cases, the ratio of the intrinsic width to the intrinsic
+  height in the resource. The <var title="">specified width</var> and
+  <var title="">specified height</var> are the values of the <code
+  title="attr-dim-width">width</code> and <code
+  title="attr-dim-height">height</code> attributes respectively.</p>
+
+  <p>The two attributes must be omitted if the resource in question
+  does not have both an intrinsic width and an intrinsic height.</p>
+
+  <p class="note">Basically, the dimension attributes can't be used to
+  stretch the image.</p>
 
   <p>To parse the attributes, user agents must use the <span>rules for
   parsing dimension values</span>. This will return either an integer