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Please look at next code and its result:

\documentclass[tikz,border=2mm]{standalone} \usepackage{tikz} \usetikzlibrary{positioning} \begin{document} \begin{tikzpicture}[every node/.style={draw=red,fill=green},] \node[label=above:a] (A) {AAA}; \node[label={[draw]above:b}, right=of A] (B) {BBB}; \begin{scope}[every label/.style={draw}] \node[label=above:c, right=of B] (C) {CCC}; \end{scope} \end{tikzpicture} \end{document}

enter image description here

I understand that labels are nodes which are created after its main node. (Look at Every non-label node in TikZ), so I understand that options draw or fill inherit main node colors as is shown in middle node. But I don't understand why every label/.style={draw} also fills the label, as is shown in right most node above. Could you explain it?

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    You might want to append style to \begin{scope}[every label/.style={draw}]. Commented Sep 2, 2013 at 9:15

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This happens because by default, every label is defined as draw=none,fill=none. By setting every label/.style=draw, you're overwriting these options, and the fill=green from the every node style is used. To get the expected behaviour, use every label/.append style=draw.

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