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Is it possible to write a command using TikZ to produce a small rounded and colored box around a piece of text, inside sentence? I know the framedbox command gives a rectangle around a piece of text (but not a rounded rectangle as far as I know).

I guess one could also adjust the color of the background when using framebox (using tips from answers to this question), but I don't think it could help with other factors such as the box's edge-width, the amount of roundness, etc.

The following picture was produced with Inkscape for the purpose of the question.

Either use TikZ directly or tcolorbox with tcbox and a lot configurable settings.

If such boxes should appear more than once, a newtcbox is appropiate, setting the options there and just saying inlinebox{foo} etc.

As can be seen from the direct usage of tcbox that the margins are too wide, but the inlinebox has a nicer look, there the margins are set with left=... and right=... and boxsep=...

documentclass{article}



PassOptionsToPackage{svgnames,x11names,dvipsnames}{xcolor}

usepackage[most]{tcolorbox}



newtcbox{inlinebox}[1]{enhanced,

 box align=base,

 nobeforeafter,

 colback=cyan,

 colframe=Green4,

 size=small,

 left=0pt,

 right=0pt,

 boxsep=2pt,

 #1}



begin{document}



Hello tcbox[enhanced,box align=base,nobeforeafter,colback=cyan,colframe=Green4,size=small]{World} -- what do you expect from the year inlinebox{2019}?





end{document}

Another option is tikzmark, which less options than tcolorbox, but allows you to connect different boxes and also detect the mode you are in (text vs. math etc.).

documentclass{article}

usepackage{tikz}

usetikzlibrary{tikzmark}

begin{document}

Here is some text and tikzmarknode[fill=cyan,fill

opacity=0.3,draw=green!60!black,thick,rounded corners,inner sep=2pt,text

opacity=1]{test}{something about relativity}.

[tikzmarknode[fill=cyan,fill

opacity=0.3,draw=green!60!black,thick,rounded corners,inner sep=2pt,text

opacity=1]{testeq}{E~=~m,c^2}

begin{tikzpicture}[overlay,remember picture]

draw[thick,cyan,latex-latex] (test.-5) to[out=-90,in=0] (testeq.east);

end{tikzpicture}]

end{document}