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1It's right on that page you linked to: "Firefox 3.6 is the first browser to officially offer support for this new feature" FWIW it's an HTML5 feature, which is quickly gaining better and better support.– Crescent FreshCommented Dec 2, 2009 at 16:30
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51The HTML5 spec says that async="true" is illegal. As a boolean HTML attribute, the presence of the attribute indicates "true", while the absence of the attribute equals "false". If the attribute is present, the only valid values for the attribute are "" and "async".– Joel MuellerCommented Dec 2, 2009 at 17:51
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Here is a live test of this attribute html5demo.braincracking.org/demo/async.php.– user1062963Commented Nov 23, 2011 at 23:39
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3This should be a bookmark to check frequently for anyone interested in this issue: en.wikipedia.org/wiki/Comparison_of_layout_engines_%28HTML5%29– pumpkintheheadCommented Mar 16, 2012 at 3:59
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