passed

dir_msub

This tests dir='rtl' on the msub tag

W3C sample	WIRIS
	$\begin{array}{c} Test & Without dir & With dir=rtl \\ msub & a_{b} & a_{b} \end{array}$

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mtable columnlines="solid" rowlines="solid" frame="solid" columnalign="center">
    <mtr>
      <mtd>
        <mtext>Test</mtext>
      </mtd>
      <mtd>
        <mtext style="width:40%">Without dir</mtext>
      </mtd>
      <mtd>
        <mtext style="width:40%">With dir=rtl</mtext>
      </mtd>
    </mtr>
    <mtr>
      <mtd>
        <mtext>msub</mtext>
      </mtd>
      <mtd>
        <msub>
          <mi>a</mi>
          <mi>b</mi>
        </msub>
      </mtd>
      <mtd>
        <mstyle dir="rtl">
          <msub>
            <mi>a</mi>
            <mi>b</mi>
          </msub>
        </mstyle>
      </mtd>
    </mtr>
  </mtable>
</math>

Author: Frédéric WANG