Hi, css3-values defines the ex unit as "Equal to the font's x-height." (and then goes into details of what the x-height is) but does not say which font to use. This can be ambiguous eg. when font-family contains multiple valid family names. For comparison, the ch unit is based on "the '0' glyph found in the font used to render it." which is well-defined, based on the font matching algorithm. -- Simon SapinReceived on Thursday, 17 January 2013 14:43:30 UTC
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