My browser, Firefox 3.6, seems to display the Mathml equations in the W3C test suite just fine. But if I copy the code into my webpage, like from [here](http://www.w3.org/Math/testsuite/build/main/General/Math/mathAdisplay2-full.xhtml), all Firefox produces is something like `x y x y`  instead of how it correctly rendered the W3C page. What am I missing here>

**EDIT**: I just tried it in Chrome and Chrome failed the test itself by rendering it as `x y x y`. Needless to say, it rendered the math in my own webpage the same.

**EDIT 2**: I tried it on a new html document. Doesn't work:

```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <title></title>
  </head>
  <body>
<math display="inline" xmlns="http://www.w3.org/1998/Math/MathML" mode="display">
  <mfrac>
    <mi>x</mi>
    <mi>y</mi>
  </mfrac>
    </math>
    <math display="block" xmlns="http://www.w3.org/1998/Math/MathML" mode="inline">
  <mfrac>
    <mi>x</mi>
    <mi>y</mi>
      </mfrac>
    </math>
  </body>
</html>

```

I swear the W3C equations render just fine though...