Opera Software recently became one of the few browser makers to pass the Acid2 test, and while that may earn the company bragging rights in the developer community, it’s unlikely to convince more Web users to switch from Microsoft’s Internet Explorer, one analyst said.

Opera initially proposed the creation of the Acid2 test as a way to highlight the lack of support for some standard HTML (hypertext markup language) and CSS (cascading style sheet) features in Internet Explorer (IE) and other browsers, said Hakon Lie, chief technology officer for Opera. The Web Standards Project (WaSP), an independent group that supports the use of standards in browsers, created and hosts the test.

To pass the test, a browser must be able to accurately display the test page. Opening the page with IE reveals a large red block with some spots on it. A browser that passes the test, however, will display a smiley face and the words "hello world."

Apple Computer’s Safari was the first to pass the test last year. It took until last week, about a full year’s worth of work, to tweak the Opera browser enough to pass the test, Lie said.

If more browsers support the features in the test, designers will be able to create better sites, he said. Developers often feel they can’t use some available tools because they aren’t supported in IE, the most widely used browser, Lie said. "There’s a reluctance for developers to use features that aren’t widely supported. The least advanced browser holds things back," he said.

Last year, Chris Wilson, a developer working for Microsoft on IE, wrote in a blog posting that Microsoft wasn’t planning to ensure that IE7, the next version of IE that is currently available as a beta, could pass the Acid2 test. He describes the Acid2 test as a broad wish list of browser features that goes beyond standard CSS and HTML. However, even though IE7 won’t pass the test, Acid2 has been helpful to Microsoft as an indicator of features that are important to developers, he said.

WaSP said it included features that Web designers want and that are based on Web standards in the test.

Trying to win customers from IE by touting support for additional design features is a tough sell for the competitive browsers, said Iris Cremers, an analyst with Forrester Research. "That’s not going to do the trick. There’s really no novelty there," she said. A recent Forrester study found that most Web users perceive that a browser’s job is to display webpages and that the pages will largely look the same no matter what browser they use.