If you look at scripd's source code, you cannot really call it "HTML5". It's the same old nested DIVs with absolute positioning and class names such as "only_ie6_border". Plus some CSS3 eye candy. Hard to see why it couldn't have been implemented years ago.
It's not just about HTML5, it's about browser support and speed for the features they use. Browser performance has increased dramatically in the past few years and many people have upgraded to browsers with much better standards support. They still have some hacks, but they can also take advantage of HTML5 when it's available like they do with @font-face.
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If you look at scripd's source code, you cannot really call it "HTML5". It's the same old nested DIVs with absolute positioning and class names such as "only_ie6_border". Plus some CSS3 eye candy. Hard to see why it couldn't have been implemented years ago.
It's not just about HTML5, it's about browser support and speed for the features they use. Browser performance has increased dramatically in the past few years and many people have upgraded to browsers with much better standards support. They still have some hacks, but they can also take advantage of HTML5 when it's available like they do with @font-face.
But that doesn't make a catchy press release.