Version 3
Opera 3 was the first version of Opera with JavaScript support, but Java was still missing. It was released for multiple operating systems on December 31, 1997.
In 1998, Opera 3.5 was released, adding Cascading Style Sheets (CSS) support and file upload capability.
Since version 3.5, Opera has supported CSS, and Håkon Wium Lie, one of the inventors of CSS, is the CTO at Opera. Up to 6.0 Opera supported most common web standards, Netscape plugins and some other recent standards such as WAP and WML for wireless devices, but its implementation of advanced ECMAScript (better known as "JavaScript") and the HTML Document Object Model was poor.
Version 3.6 was released on May 12, 1999.
Read more about this topic: History Of The Opera Web Browser
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“Truth cannot be defined or tested by agreement with ‘the world’; for not only do truths differ for different worlds but the nature of agreement between a world apart from it is notoriously nebulous. Rather—speaking loosely and without trying to answer either Pilate’s question or Tarski’s—a version is to be taken to be true when it offends no unyielding beliefs and none of its own precepts.”
—Nelson Goodman (b. 1906)