The big winner of the Sputnik tests so far is the Opera browser, with 78 failures, according to Google's bull's-eye comparison chart. Microsoft's Internet Explorer 8 browser performed the worst (463 failures) relative to the four other browsers tested by Google.
Clumped next to Opera in the center position of the chart were Apple's Safari (159 failures), Google's Chrome (218 failures) and Mozilla's Firefox (259 failures).
According to Google's blog, the Sputnik test runner "can be seen as a continuation of and a complement to existing browser conformance testing tools, such as the Acid3 test."
Internet Explorer 8 shows a low score (20/100) on Acid3, but Microsoft has tended to disparage that test and the company still tends to ignore it. A Microsoft official even described a low Acid3 score (32/100) for its forthcoming Internet Explorer 9 browser, which is still under wraps.
ECMAScript 5 was published on December 3, 2009 as part of the ECMA-262 spec. The technology in ECMAScript 5 is based on ECMAScript 3 and came about after Microsoft and Yahoo dissented against ECMAScript 4, according to Wikipedia's account.
Kurt Mackie is senior news producer for 1105 Media's Converge360 group.