Demo for MathML with ALTTEXT tag

1:

Motion energy =  ${\displaystyle \frac{1}{2}}$  · mass · (speed)²

Should be read like "Motion energy = one half times mass times (speed)²

2: $\frac{\sqrt{\text{a}}}{b}$

Should be read like "Frac Root a EndRoot Over b EndFrac"

3: $a^2+b^2=c^2$

Should be read like "A squared plus b squared equals c squared"