stretchy sum product and integral [Was: MathML in Firefox 3 beta 5 (Mozilla 1.9)]

On Mon, 28 Apr 2008 23:44:03 +0200, Alvaro wrote:

> Sum, Product and Integral should not stretch arbitrarily,

I'd be interested to hear why you say that?

I had thought that Sum and Product looked better without
stretching to enclose their contents but that maybe due to looking
at too much LaTeX output.

The MathML spec explicitly says: "Also, operators such as ∑,
∫, /, and vertical arrows stretch vertically by default."

http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#id.3.2.5.8.2

UTR #25 also indicates that these sometimes stretch.
"Large Operators include n-ary operators like summation and
integration. They may expand in size to fit their associated
expressions."

http://www.unicode.org/reports/tr25/tr25-9.html#_Toc323