Re: Inline image: valign ignored in HTML output, works in PDF

Bård Peter T. wrote:
> it seems that for HTML output, it is not possible to use the 
> *valign* on inline images. Here is a small SVG image added to a 
> paragraph with inlinemediaobject, the setting valign is set to “middle” 
> on the imagedata.
> 
> On the left you see the HTML output and on the right is the PDF output. 
> PDF output is “correct”, image is in the middle of the line. It doesn’t 
> work in HTML, it is always bottom aligned.

That's right. Same behavior with a PNG image.



> 
> Is there a way to get valign to work in HTML/Webhelp output?

Sorry but the answer is no.

This is a limitation of the DocBook XSL Stylesheets (these stylesheets 
are documented here: 
https://docbook.sourceforge.net/release/xsl/current/doc/param.html and 
here: http://www.sagehill.net/docbookxsl/index.html).

If you take a look at <xsl:template name="process.image"> found in 
XXE_install_dir/addon/config/docbook5/xsl/html/graphics.xsl, you'll find 
a long comment explaining this kind of limitation:
---
        The HTML img element only supports the notion of content-area
        scaling; it doesn't support the distinction between a
        content-area and a viewport-area, so we have to make some
        compromises.
        ...
        Finally, align and valign are troublesome. Horizontal alignment 
is now
        supported by wrapping the image in a <div align="{@align}"> (in 
block
        contexts!). I can't think of anything (practical) to do about 
vertical
        alignment.
  ---

We, XMLmind Software, are not the authors of the DocBook XSL Stylesheets 
  therefore we are not going to improve this. Please do not hesitate to 
send a request for enhancement to:

[email protected]


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