my Latex and Tex4ht cheat sheet

\documentclass{standalone}
\usepackage{tikz}
\usepackage{tikz-qtree}
\begin{document}
\tikzset{font=\small}
\begin{tikzpicture}
\Tree [.A
[.\node(B){B}; ]
[.\node(C){C}; ]
]
\begin{scope}[xshift=0in,yshift=-2cm]
\Tree [.\node(Dx){D};
[.E ]
[.F ]
]
\end{scope}
PDF
\draw[-] (B) -- (Dx);
\draw[-] (C) -- (Dx);
\end{tikzpicture}
\end{document}
\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
\draw [] (3,0) -- (0,0) -- (0,3);
\draw (0,0) rectangle (3,3);
\draw [fill=lightgray] (0,2.8)--(0,0)--(2.8,0);
\node [font=\Huge] at (2,2) {$0$};
0
\end{tikzpicture}
\end{document}
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