David,
The interfaces for text and tspan are defined here:
http://www.w3.org/TR/SVG/idl.html as:
interface SVGTextElement : SVGTextPositioningElement,
SVGTransformable {
};
interface SVGTSpanElement : SVGTextPositioningElement {
};
Note how tspan does not have an SVGTransformable interface.
http://www.w3.org/TR/SVG/types.html#InterfaceSVGTransformable
is derived from SVGLocatable
http://www.w3.org/TR/SVG/types.html#InterfaceSVGLocatable
And it's SVGLocatable that gives text the getBBox DOM method.
As far as text decoration is concerned I'm still waiting for a response to this
question to w3c: http://lists.w3.org/Archives/Public/www-svg/2009Oct/0010.html
The firefox bug for text-decoration is
https://bugzilla.mozilla.org/show_bug.cgi?id=317196
getBBox works on the entire text, getExtentOfChar works on individual glyphs.
getExtentOfChar
Returns a tightest rectangle which defines the minimum and maximum
X and Y values in the user coordinate system for rendering the
glyph(s) that correspond to the specified character. The
calculations assume that all glyphs occupy the full standard glyph
cell for the font. If multiple consecutive characters are rendered
inseparably (e.g., as a single glyph or a sequence of glyphs), then
each of the inseparable characters will return the same extent.
The "all glyphs occupy the full standard glyph cell for the font" is the key
phrase here.
Did I answer everything?
Best regards
Robert.
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