Inkscape doesn't allow baseline-shift on tspan elements

[Will Pittenger]

I am attempting to manually cause a tspan (which is a child of another tpsan) to be aligned as superscript. I thought that once I had the child tspan, I could add "vertical-align:super;" to its style with the XML editor. But Inkscape strips out vertical-align regardless of its value.

[Will Pittenger (will-pittenger1)]

Oh, I was using "Inkscape 0.47pre4 , built Oct 12 2009".

[Will Pittenger (will-pittenger1)]

The W3c spec for TSPAN CSS attributes is at http://www.w3.org/1999/08/WD-SVG-19990812/text.html#CSSFontPropertiesUsedBySVG.

[Will Pittenger (will-pittenger1)]

I am told that Batik also fails to render the superscript sample.

[Will Pittenger (will-pittenger1)]

It looks like Bug #269374 is related. That would provide UI for things like superscript.

[su_v (suv-lp)]

… or Bug #170324 “subscript, superscript”?
<https://bugs.launchpad.net/inkscape/+bug/170324>

[Will Pittenger (will-pittenger1)]

Further tests show that a related CSS attribute is also stripped: baseline-shift (http://www.w3.org/TR/SVG/text.html#BaselineShiftProperty)

[Will Pittenger (will-pittenger1)]

Those following this bug might want to follow https://bugzilla.mozilla.org/show_bug.cgi?id=527376 as well. That is the cooresponding Firefox bug.

[Will Pittenger (will-pittenger1)]

I am told that "vertical-align" never made it into a recommendation. "Baseline-shift" seems to have replaced it. So I changed the title. Both Firefox and Inkscape still fail with the new attribute. New sample coming.

[su_v (suv-lp)]

…which AFAIU brings this RFE right back to what was already requested and discussed in bug #170324 “subscript, superscript". Or are there basic differences between these feature requests that I miss? Otherwise I propose to merge the discussion into one report only - i.e. linking this report as duplicate to bug #170324.

[Will Pittenger (will-pittenger1)]

Well, at least add the XML editor to the bug. It shouldn't strip valid CSS out.

[su_v (suv-lp)]

some notes while searching for related info:

a) Inkscape 0.46 and 0.47(pre) show the same behavior:
  - baseline-shift is not supported by the renderer
  - it cannot be added as CSS style property in the XML editor

b) as long as you don't edit the text element in Inkscape,
   the CSS style property is not stripped when saving as Inkscape SVG.

c) adding as CSS style property to <tspan>
   <tspan style="font-size:12px;baseline-shift:super">st</tspan>
   with the built-in XML Editor fails with this Inkscape console message:
WARNING **: Unimplemented style property SP_PROP_BASELINE_SHIFT: value: super

d) adding as separate XML style attribute to <tspan>
   <tspan style="font-size:12px" baseline-shift="super">st</tspan>
   with the built-in XML Editor works but the attribute is still not
   supported by the renderer.

other links:
Inkscape Wiki: CSS Support - Updating for changes to <style> content
<http://wiki.inkscape.org/wiki/index.php/CSS_Support#Updating_for_changes_to_.3Cstyle.3E_content>