SVG 1.1 (officially) only supports single-line text, so there is no line-height .
I just tried to create a block of text in Inkscape and use the flowRoot element (containing the flowPara element with the actual text in it). Then the flowRoot element actually has the line-height assigned to it (in%).
I do not know how widespread such support is, since it was part of SVG 1.2 . You can also look here: Automatic wrapping of lines in SVG text
Danman
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