tcolorbox without background color (transparent)

Question

I would like to have transparent background in tcolorbox.

Most time colback=white is a work-around but it is not clean.

\documentclass{article}
\usepackage{pagecolor}
\pagecolor{yellow}
\usepackage{tcolorbox}
\begin{document}
\begin{tcolorbox}[
    title=Title,
%   opacityback=1,  % this does not work
%   colback=white,  % this is not what I want
]
This should have transparent backround. \\
Background should look yellow. 
\end{tcolorbox}
\end{document}

Answer 1

Thanks to flav.

Transparent background in tcolorbox is only possible with the skin key standard jigsaw. Otherwise there is no effect of the key opacityback=0

\documentclass{article}
\usepackage{xcolor}
\usepackage{pagecolor}
\pagecolor{yellow}
\usepackage{tcolorbox}
\begin{document}
\begin{tcolorbox}[
    standard jigsaw,
    title=Title,
    opacityback=0,  % this works only in combination with the key "standard jigsaw"
]
This should have transparent backround. \\
Background should look yellow. 
\end{tcolorbox}
\end{document}

Answer 2

You must use enhanced :

\documentclass{article}
\usepackage{pagecolor}
\pagecolor{yellow}
\usepackage{tcolorbox}
\tcbuselibrary{skins}
\begin{document}
\begin{tcolorbox}[enhanced,
  title=Title,
  opacityframe=.5,
   opacityback=.5,  % this does not work
%   colback=white,  % this is not what I want
]
This should have transparent backround. \\
Background should look yellow. 
\end{tcolorbox}
\end{document}