Actual (live) result in your browser:
Expected result (screen shot 162px wide, 92px tall)
References:
"middle
align the vertical midpoint of the element
(typically an image) with the baseline plus half the x-height of the
parent"
CSS 1, section
5.4.4, vertical-align property
"middle
Align the vertical midpoint of the box with the
baseline of the parent box plus half the x-height of the parent."
CSS 2.1,
section 10.8.1, vertical-align property
Typographical
measurement systems: the x-height by Jan Roland Eriksson
Internet Explorer 8, NS 6.1, NS 6.2, NS 7.0, NS 7.1, NS 7.2, Firefox 1.5.x, Firefox 2.0.0.3, Firefox 3, Safari 2.0.4, Safari 3.0.4, Konqueror 3.5.5, Konqueror 4.1, Seamonkey 1.x, Seamonkey 2.x, K-meleon 1.x, Epiphany 2.14 all pass this test.
This bug has been reported at Opera BTS as bug DSK-246311.