Add a rect with dimensions of a standard bounding box for MathJax SVG output

[racoon]

MathJax renders SVG output as paths. One effect is that the bounding box from .getBbox() is tightly around the output. For example, the bounding box around a formula that contains only "x" will have less height than around a formula that contains only "X".

This is different to the standard SVG text. Here the bounding box is always the same height independent of the content.

Is there a way to set a SVG rect with the formula that has the same dimensions as the standard box?
(I don't mind that some "taller" formulas will extend beyond this rect.)

I know that the LaTeX command \bbox is supported. But I don't know how to use it to get what I want, since the \bbox's dimensions are relative to the tight SVG MathJax output. But I want a box that has fixed dimensions relative to the text baseline. So adding, for example, a padding did not help.

I can calculate a couple of values from the standard SVG text using .getBbox(). So let's say the full height of the bounding box of a SVG text element is H (to illustrate: this is roughly the height of "Äg") and the height from the baseline to the top is h (to illustrate: this is roughly the height of "Ä").

Here is an illustration of what I have (blue) and the box I want to add to the formula (red):

Any help greatly appreciated!

[Davide P. Cervone]

Use {\strut x} to get a box that is the "standard" height and depth.  So \bbox[red]{\strut x} and \bbox[red]{\strut Ag} will both be the same height.  If the standard strut is not the right size for you, then you can define your own:

\def\myStrut{\vphantom{Äg}}

or

\def\myStrut{\Rule{0px}{1em}{.2em}}

for example.

Davide

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[racoon]

The "standard" \strut box seems to be a bit off compared to the standard box around SVG TEXT elements. Could it be that the latter is dependent on the browser while the former is set independently?

[daniel.r...@gmail.com]

My fault. I actually had an extra space that made the \strut box come off. So it seems actually to do exactly what I described concerning the heights above. Great.

However, I did not realize before that the standard SVG TEXT also adds some more width. Unfortunately, that seems not to be done by \strut, if I see this correctly.