Alternatives:	(mml file)  (full) (simple) (plain) (form) (slideshow)
File:	Presentation/CSS/maction/maction-02
CVS-ID:
Author:	George Chavchanidze, Opera Software ASA
Description:	You should see fraction n!/k!(n-k)! once you place mouse pointer over math expression below
Sample Rendering:

Your browser's rendering:

Source Code:

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<maction actiontype="tooltip">
<mrow>
<mfenced>
<mrow>
<mtable>
<mtr><mtd><mi>n</mi></mtd></mtr>
<mtr><mtd><mi>k</mi></mtd></mtr>
</mtable>
</mrow>
</mfenced>
</mrow>
<mrow>
<mfrac>
<mrow><mi>n</mi><mo form="postfix">!</mo></mrow>
<mrow><mi>k</mi><mo form="postfix">!</mo><mo fence="true">(</mo><mi>n</mi><mo>−</mo><mi>k</mi><mo fence="true">)</mo><mo form="postfix">!</mo></mrow>
</mfrac>
</mrow>
</maction>
</math>