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\section{Quick Intro} Introduction (tl;dr)}  Authorea Beta supports LaTeX writing. In order to insert LaTeX: \textbf{click on the Insert button in the toolbar and then select LaTeX from the dropdown}. A LaTeX label shows next to the LaTeX block in which you can write LaTeX notation.  \subsection{Some tips for writing LaTeX in Authorea}  \begin{enumerate}  \item Click anywhere outside of the LaTeX block to render it.  \item Hover on Preview to see a Preview of the rendered content.  \item Do not paste an entire LaTeX article! Instead import documents from your homepage.  \item Only type LaTeX content in a LaTeX block, i.e. everything you would write after \verb|\begin{document}|.  \item Do not type preamble (e.g. documentclass), frontmatter, macros or figures.  \item To add macros (newcommands) and packages, click Settings $\rightarrow$ Edit Macros  \item Use the Insert Figure button to insert images (and data).  \item Use math mode for equations, e.g. $\mathcal L_{EM}=-\frac14F^{\mu\nu}F_{\mu\nu}$.  \item Try the citation tool (click cite) to find and add citations, or use \verb|\cite{}|.  \item To insert more LaTeX blocks click Insert $\rightarrow$ LaTeX.  \item You can use sectioning commands like \verb|\section{},\subsection{},\subsubsection{}| to add headings.\footnote{You can toggle heading numbering on/off from the article settings. This footnote is generated via \verb|\footnote{}|}  \end{enumerate}   \section{Background}  \authorea has deployed a new backend for its \latex input language, teaming up with the ambitious \latexml project, which strives to offer a full reimplementation of {\TeX} with targeted generation of web-first manuscripts, supporting HTML5 and ePub. Note: \latexml is the default engine for rendering {\TeX} in Authorea Beta articles. If you bump into any problems, make sure to visit your article settings and select your LaTeX renderer to \latexml. In this article you can find an overview of some of our new high-impact authoring features. \textbf{Note: this article does not cover mathematical notation. Check out \href{https://www.authorea.com/users/77723/articles/110898-how-to-write-mathematical-equations-expressions-and-symbols-with-latex}{this cheatsheet} and \href{https://www.authorea.com/users/3/articles/165181-latex-mathematics-examples}{these examples} to see how LaTeX can be used to write advanced mathematics.}