1 <html xmlns='http://www.w3.org/1999/xhtml'>
5 <p id='t1'>The green square should be vertically centered:
6 <math xmlns='http://www.w3.org/1998/Math/MathML'>
8 <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)'/>