Wow! I'm flawed by the arrogance of Apple in their marketing of Safari 4 beta.
They claim Safari is the first web browser to have features that Firefox and Opera have had for up to 15 years! Some of the features they claimed to be the first browser to have were available in Internet Explorer 5.
Opera's has document clearly all the dates and version all each feature was included in Opera.
When Google released Chrome, they had the decency to credit other browsers for some of their features. Nobody cares that they borrowed features. It creates competition and is good for consumers. But don't lie to your customers and claim old ideas as your own.
You can read the debate about which features were innovated by Safari and which were innovated by Opera at Call to action: Deceptive marketing of Safari 4.