Dear Vafa Khalighi,
\documentclass{article}
\usepackage{atbegshi}
\usepackage{tikz}
\AtBeginShipout{%
\AtBeginShipoutUpperLeft{%
\put(0,0){%
\tikz[remember picture, overlay]\shade[top color=blue!15, bottom
color=blue!80] (current page.north east) rectangle +(-5,-28);
}}}
\begin{document}
This is a test
\newpage
This is a test
\newpage
This is a test
\newpage
This is a test
\end{document}
You see that shaded rectangle on every single page of the document.
However, if you run xelatex, that rectangle does not appear on the
first and second pages. What is wrong?
Probably because pgfsys-xetex.def and/or pgfsys-dvipdfmx.def,
which are used by XeTeX, are incomplete.
I think there are other tikz examples in which XeTeX cannot
reproduce results by pdfTeX.
--
Best regards,
Akira KAKUTO
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