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HTML 4.0 issue pertaining to the IMG tag

From: Mark Wood <mdw@kodak.com>
Date: Fri, 29 Aug 1997 12:32:29 -0400
Message-Id: <199708291632.MAA20694@kewl.itc.kodak.com>
To: www-html-editor@w3.org
Cc: mdw@itc.kodak.com

Why doesn't the HTML4.0 spec support percentages for the height & width
attributes to the IMG tag?  As I understand the spec (I've reproduced
the relevant portions below), the values for the HEI and WID
attributes must be expressed as absolute pixels.

I understand that in HTML 4.0, the OBJECT tag is the preferred way of
including images.  However, given that IMG is still an option in 4.0,
and that a lot of browsers do support relative height and width
attributes now, and it seems like it would have been nice to have that
standardized.

   <Excerpts from HTML spec>

   Lengths and Pixels

   Values of the type "length" may either be specified as an integer
   representing the number of pixels of the canvas (screen, paper) or as a
   percentage of the available horizontal or vertical space. The HTML DTD
   generally uses %Length for length values that permit percentages and %Pixels
   for values that only permit pixels.

   ....

   Including an image: the IMG element

   <!-- To avoid problems with text-only UAs you need to provide
	a description with ALT, and avoid server-side image maps -->
   <!ELEMENT IMG - O EMPTY      --  Embedded image -->
   <!ATTLIST IMG
     %attrs;                          -- %coreattrs, %i18n, %events --
     src         %URL       #REQUIRED -- URL of image to embed --
     alt         CDATA      #IMPLIED  -- description for text only browsers --
     align       %IAlign    #IMPLIED  -- vertical or horizontal alignment --
     height      %Pixels    #IMPLIED  -- suggested height in pixels --
     width       %Pixels    #IMPLIED  -- suggested width in pixels --
     border      %Pixels    #IMPLIED  -- suggested link border width --
     hspace      %Pixels    #IMPLIED  -- suggested horizontal gutter --
     vspace      %Pixels    #IMPLIED  -- suggested vertical gutter --
     usemap      %URL       #IMPLIED  -- use client-side image map --
     ismap       (ismap)    #IMPLIED  -- use server-side image map --
     >

-----------------------------------------------------------------------
Mark D. Wood, Ph.D.                                   mdw@itc.kodak.com
Kodak Networked Imaging Technology Center           phone: 716 253 5489
1447 St. Paul Street                                  FAX: 716 253-6284
Rochester, NY  14653-7102
Received on Friday, 29 August 1997 12:33:42 GMT

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