Accurate ex unit implementation

Initial condition: you must have the Ahem font (March 2006 version) installed

Expected results: the black box should be 300px by 300px

This testcase is void for now. The CSS 2.1 offers a loose and flexible implementation of ex as a length unit offering 2 distinct, separate manners to implement it. IE 8 RC1 build 18372 is not able to determine xHeight font info (sxHeight) in several fonts.

Actual results in Opera 10.0 alpha build 1229: the black box is 187px by 187px

Opera 10.0 assumes 1ex = = 0.5em which is incorrect

Actual results in Safari 3.2 build 525.26.13: the black box is 375px by 375px

Safari 3.2 assumes 1ex = = 1em which is incorrect

Firefox 1.x, Firefox 2.x, Firefox 3.x, Seamonkey 2.x, K-meleon 1.x all pass this test.

This bug has been reported at connect's IE beta feedback as bug 409460 and has been closed.

This bug has been reported at WebKit Bugzilla as bug 16362.