-Points to address:
-\begin{enumerate}
- \item What this is.
- \item Why we should care
- \item Most recent development
- \item Do we really mean ``infinite''? (No. Sorry. We lied)
- \item Foundational papers. Historical notes.
-\end{enumerate}
+The emergence of the internet, web browsers, XML/HTML, JavaScript and related technologies has seen a revolution in the ways in which information can be presented digitally, and the PDF standard itself has begun to move beyond static text and figures\cite{hayes2012pixels, barnes2013embedding}. However, the popular document formats are still designed with the intention of showing information at either a single, fixed level of detail, or a small range of levels.