\documentclass[preview]{standalone}
\def\pgfsysdriver{pgfsys-tex4ht.def}
\usepackage{tikz}\begin{document}\usetikzlibrary{positioning}
\begin{tikzpicture}
  \node[circle,fill,label=above:$P_1$,node font=\Large] (point1) at (0,0) {};
  \node[circle,fill,label=above:$P_2$,node font=\Large] (point2) at (3,0) {};
  \draw[latex-latex] (point1) -- (point2);
\end{tikzpicture}\end{document}