Hi Dave,
The status of the width and many other
attributes changed in HTML5, which is what Epub3 is based on.
For most HTML5 elements, the width attribute is deprecated,
and should be replaced with the CSS style. In an earlier
draft of HTML5, that was true for img as well. However, the
latest draft shows that width and height attributes are
permitted on img.
The xhtml5 stylesheet is a customization of
the DocBook xhtml stylesheet. To handle these deprecated
attributes, there is a template with match="*" in
mode="convert.to.style" that rewrites the deprecated
attributes as parts of a style attribute for an HTML element.
That template is in xhtml5/html5-element-mods.xsl. You will
see that it includes width.
Since this is a mode, we should be able to add
a template with match="x:img" (the x: namespace is the XHTML
namespace) and change that behavior so width is output for
img. However, I'm not sure it is that easy, since width is
also involved with creating a viewport for an image. I'll
look into it.
Sent: Friday, January 18, 2013 6:33 AM
Subject: [docbook-apps] Setting width for
mediaobject in EPUB
I'm specifying the width of an image using the <imagedata>
attribute 'width' (and I've also tried 'contentwidth'). When I
transform to an EPUB 3, I get the width coded as a style
attribute:
<img style="width: 150; " src="" alt="alt text
for Creative Commons licence logo" />
The image doesn't render to a width of 150px. But removing the
style setting and replacing it with the img attribute 'width' does
work. Where do I find the stylesheet coding that sets
style="width: ; ". I've looked in XHTML1-1/graphics.xsl and
there's nothing obvious that sets the style attribute with a value
of 'width' (all instance of 'style' refer to text-align).
--
Dave Gardiner