When we look at the long lists of standards (even from just one standards body, like the W3C), which standards are the most important for us to support? The web has many kinds of standards – true industry standards, like those from the W3C, de facto standards, unilateral standards, open standards, and more. Some standards like RSS or OpenSearch lack a formal standards body yet work pretty well today across multiple implementations. Many advances in web technologies, like the img tag, start out as unilateral extensions by a vendor. The X in AJAX, for example, has only started the formal standardization process relatively recently. As some comments have pointed out, CSS 2.1, one of the key standards that Acid2 exercises, is not “finalized” yet. Different individuals have different opinions about different standards. The important thing about the Acid2 test is that it reflects what one particular group of smart people “consider most important for the future of the web.”
Now, with all that context, I’m delighted to tell you that on Wednesday, December 12, Internet Explorer correctly rendered the Acid2 page in IE8 standards mode. While supporting the features tested in Acid2 is important for many reasons, it is just one of several milestones for the interoperability, standards compliance, and backwards compatibility that we’re committed to for this release. We will blog more on these topics. Here’s a relevant video.