| <!DOCTYPE html> | |
| <title><semantics> - mozilla bug 21479 (reference)</title> | |
| <meta charset="utf-8"/> | |
| <p> | |
| <math xmlns="http://www.w3.org/1998/Math/MathML"> | |
| <mover> | |
| <mspace width="300px" height="10px" mathbackground="black"></mspace> | |
| <mo>¯</mo> | |
| </mover> | |
| </math> | |
| </p> |