There's also PDF/PostScript as a format, but it's also made for fixed/absolute/print layouts. HTML/CSS (and I suppose related tech like XAML) were the only tech

There's also PDF/PostScript as a format, but it's also made for fixed/absolute/print layouts. HTML/CSS (and I suppose related tech like XAML) were the only technologies where responsiveness was first priority. Now if only the browser conglomerates can disrupt Pantone too...