XMLHttpRequest) and dynamically updating the current page with the results (via dynamic HTML). That was a considerable usability improvement from always performing complete page reloads.
With Chrome OS, the web platform is the native platform. This approach has several advantages:
We also need a hill to take, in order to scope and focus our efforts. Recently we saw the pdf.js project [which renders PDFs via HTML5, without plugins] expose small gaps that needed filling in order for “HTML5” to be a superset of PDF. We want to take a bigger step now, and find the gaps that keep web developers from being able to build apps that are—in every way—the equals of native apps built for the iPhone, Android, and WP7.
 Ajax is a shorthand, but not an acronym, which is why it isn’t styled as AJAX.