suppress floats here on first page

Question

I must hand in a document where floats on the first page are only allowed to be placed at the bottom of the page (not t and not h).

I know that I can forbid all floats on a page with \suppressfloats and that I can forbid floats on the top of a page with \suppressfloats[t]. But \suppressfloats[h] does not work.

I have tried

\usepackage{float}
\usepackage{afterpage}
\floatplacement{figure}{b}

\begin{document}
\afterpage{\floatplacement{figure}{htbp}}

but it does not work.

How can I suppress floats at t and h while allowing them at b on the first page and allowing them at htbp for the rest of the document?

Example:

\documentclass{article}
\usepackage{blindtext}

\usepackage{float}
\floatplacement{figure}{b} % I would like to have `htbp` here

\usepackage{afterpage}

\begin{document}
\suppressfloats[t] % works
\suppressfloats[h] % seems to have no effect
\afterpage{\floatplacement{figure}{htbp}} % seems to have no effect
\blindtext

\begin{figure}
    \centering
    \rule{.3\linewidth}{2cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{.7\linewidth}{5cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{10cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{.6\linewidth}{8cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{7cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{2cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{4cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{5cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{11cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{9cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{4cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{5cm}
    \caption{something black}
\end{figure}


\listoffigures
\end{document}

---

EDIT David Carlisle's answer avoids floats here on the first page. But it does not place the float at the bottom instead as long as I basically allow the here in \floatplacement. (But when I change it to \floatplacement{figure}{b} it is placed on the bottom of the first page as it should.) Could it be that LaTeX first decides to place it here, then realizes it can not actually place it here because \intextsep is too big and then moves it to the next page without checking whether putting it at the bottom would be possible?

Can someone recommend a good documentation which explains how the placing of floats exactly works?

Answer 1

You could do something like this which allows h later (eg figure 14 on page 10)

\documentclass{article}
\usepackage{blindtext}

\usepackage{float}
\floatplacement{figure}{htbp} % I would like to have `htbp` here

\usepackage{afterpage}
\newlength\zzz
\setlength\zzz{\intextsep}
\begin{document}
\suppressfloats[t] % works
\intextsep\textheight
\afterpage{\global\intextsep\zzz} % seems to have no effect
\blindtext

\begin{figure}
    \centering
    \rule{.3\linewidth}{2cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{.7\linewidth}{5cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{10cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{.6\linewidth}{8cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{7cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{2cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{4cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{5cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{11cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{6cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{9cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{4cm}
    \caption{something black}
\end{figure}

\blindtext

\begin{figure}
    \centering
    \rule{\linewidth}{5cm}
    \caption{something black}
\end{figure}


\listoffigures
\end{document}