The mfrac element is used to display a fraction.
<math> <mfrac> <mi>y</mi> <mn>3</mn> </mfrac> </math>
If the fraction contains a single element in the numerator and a single element in the denominator, then the simple coding show above will work.
<math> <mfrac> <mrow> <mn>3</mn> <mi>y</mi> </mrow> <mrow> <mn>12</mn> </mrow> </mfrac> </math>
If either the numerator or the denominator, or both, contain multiple elements, then use the mrow element to specify which elements go in the numerator and which go in the denominator.
<math> <mfrac> <mrow> <mn>2</mn> <mi>x</mi> <mo>-</mo> <mn>14</mn> <mo>+</mo> <mn>3</mn> <mo>(</mo> <mi>x</mi> <mo>+</mo> <mn>2</mn> <mo>)</mo> </mrow> <mrow> <mn>6</mn> <mo>(</mo> <mn>2</mn> <mi>x</mi> <mo>+</mo> <mn>2</mn> <mo>-</mo> <mn>4</mn> <mo>(</mo> <mn>4</mn> <mi>x</mi> <mo>-</mo> <mn>2</mn> <mo>)</mo> <mo>)</mo> </mrow> </mfrac> </math>
Using the row element and the mo element to define parentheses, you can define some pretty complex fractional expressions, as shown above.
<math> <mfrac> <mfrac bevelled="true"> <mi>y</mi> <mn>3</mn> </mfrac> <mn>12</mn> </mfrac> </math>
By nesting mfrac elements you can create multi-level fractions. A multi-level fraction can sometimes be made more understandable by using a diagonal fraction bar. To create a diagonal fraction bar, add the bevelled attribute, set to "true", to the mfrac opening tag.
More Graphics Design Tips:
• Coding a Matrice in MathML
• Free Replacement for Overpriced Photoshop
• MathML Elements to Display Subscripts and Superscripts
• Graphic Design Meets Open Source
• MathML Element to Display a Fraction
• Basic Inkscape Vector Drawing
• Inkscape Grouping
• SVG Code to Place Text on a Curved Path
• Inkscape Document Properties
• How to Make a Simple Animated Banner in Flash CS3