| <html xmlns='http://www.w3.org/1999/xhtml'> | |
| <head> | |
| </head> | |
| <body> | |
| <p id='t1'>The green square should be vertically centered: | |
| <math xmlns='http://www.w3.org/1998/Math/MathML'> | |
| <mi>x</mi> | |
| <div xmlns='http://www.w3.org/1999/xhtml' style='display: inline-block; height: 20px; width: 20px; vertical-align: middle; background-color: rgb(0,255,0)'/> | |
| </math> | |
| </p> | |
| </body> | |
| </html> |