A recent set of HTML5 discussions are changing the course of Comet. First, a recap of the last two years of Comet: With long-polling we set the bar to cross-browser push. With XHR streaming and ActiveXObject(’htmlfile’) we raised it to cross-browser streaming. With SSE we’ve been trying to raise the bar to native, cross-browser streaming. And there we’ve sat, hoping that browser vendors actually implement the latest SSE spec.