The following code fails to do what I want:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,calc}
\begin{document}
\tikz{%
\draw (0,0) -- (\textwidth, 0) node[draw, inner sep=5pt,at start, anchor=north] (A) {\large\textbf{\textsf{Example}}};
}
\end{document}

The problem is that the node's left most rectangular border is not being position at the start of the line. As it is only the middle of the node is being placed at the beginning of the line. Any insights?

north west, if zoomed is the middle of the line drawn not exactly flush with the line and the rectangle right? – azetina Mar 05 '13 at 19:11outer sep, I was just about to add something about that. (If I understand you correctly, that is.) – Torbjørn T. Mar 05 '13 at 19:14outer septo zero does the trick right? – azetina Mar 05 '13 at 19:22anchor=north westisbelow left. – Qrrbrbirlbel Mar 05 '13 at 19:26