निरंजन
I am trying to draw a line from one (\tikz)mark to another one from my document. As can be seen in the following code; it works correctly when both the marks are present on a single page, but doesn't work when the page is crossed.


\documentclass{article}
\usepackage{lipsum}
\usepackage{tikz}
\usetikzlibrary{tikzmark}

\begin{document}
\begin{list}{\tikzmark{one}}%
\item Hello world
\end{list}

\lipsum%[1]% Works fine when both the marks are on the same
% page.

\begin{list}{\tikzmark{two}}%
\item Hello world
\end{list}
\begin{tikzpicture}[remember picture]
\draw[overlay] (pic cs:one) -> (pic cs:two);
\end{tikzpicture}
\end{document}


PS: Kindly don't suggest tcolorbox or mdframed solutions. I have tried both of them and there are various reasons for not choosing them for this purpose. Don't worry about that line overlapping the text. That lipsum text is just a place-holder.
samcarter
Tikzpictures don't break across pages. You'll have to split it into one tikzpicture per page:


\documentclass{article}
\usepackage{lipsum}
\usepackage{tikz}
\usetikzlibrary{tikzmark}
\usetikzlibrary{calc}
\usepackage{tikzpagenodes}

\begin{document}

\begin{list}{}{}%
\item[\tikzmark{one}] Hello world
\end{list}
\begin{tikzpicture}[remember picture]
\draw[overlay]
let \p1 = (pic cs:one),
\p2 = (current page text area.south)
in
(pic cs:one) -- (\x1,\y2);
\end{tikzpicture}

\lipsum%[1]% Works fine when both the marks are on the same
% page.

% make sure to place this code on the second page
\begin{tikzpicture}[remember picture]
\draw[overlay]
let \p1 = (pic cs:one),
\p2 = (current page text area.north west),
\p3 = (current page text area.south west),
in
(\x1,\y2) -- (\x1,\y3);
\end{tikzpicture}
}
\lipsum
\lipsum

\begin{list}{}{}%
\item[\tikzmark{two}] Hello world
\end{list}
\begin{tikzpicture}[remember picture]
\draw[overlay]
let \p1 = (pic cs:two),
\p2 = (current page text area.north)
in
(\x1,\y2) -- (pic cs:two) ;
\end{tikzpicture}

\RemoveFromHook{shipout/foreground}[foo]
\end{document}

(I moved \tikzmark to the label of the first item, otherwise you risk to define the same mark multiple times)

![Screenshot 2022-07-23 at 12.45.16.png](/image?hash=1445f57f37477a16488c33c7b64b2c61affee9871470c06d8e64f23abe2673e2)

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