Highlighting bibliography entries based on keywords

Question

I'd like to highlight particular bibliography entries by changing the background color. I really like the way this looks in moewe's solution here, but I want to specify which entries are being highlighted by setting a keyword, rather than highlighting every second entry.

The highlighting methods in these answers allow me to select bibliography entries based on keywords, but I can only figure out how to use to it to highlight the text color, not the background color.

Can someone suggest a way to highlight entries with a specific keyword by changing the background color (with the linked method or some other one)? I use Biblatex, but am bound to the bibtex backend and regular pdflatex.

Thanks!

Here's a (trivial) MWE:

\documentclass[fontsize=11pt,twoside,numbers=noendperiod]{scrartcl}
\usepackage[
citestyle=numeric,
bibstyle=authoryear,
sorting=none,
,uniquename=false
,uniquelist=false
,backref=false
,block=space
,maxbibnames=99
,maxcitenames=2
,doi=false
,url=false
,date=year
,backend=bibtex
]{biblatex}
\makeatletter
\input{numeric.bbx}
\makeatother
\addbibresource{highlighting.bib}
\begin{document}
\cite{bender-koller-2020-climbing,hovy21biases}
\printbibliography
\end{document}

Here's highlighting.bib:

@article{hovy21biases,
  author          = {Dirk Hovy and Shrimai Prabhumoye},
  journal         = {Language and Linguistics Compass},
  number          = {15},
  issue = {8},
  title           = {Five sources of bias in natural language processing},
  year            = {2021},
  doi = {10.1111/lnc3.12432}
}
@inproceedings{bender-koller-2020-climbing,
    title = "Climbing towards {NLU}: {On} meaning, form, and understanding in the {Age} of {Data}",
    author = "Bender, Emily M.  and
      Koller, Alexander",
    booktitle = "Proceedings of the 58th Annual Meeting of the
                  Association for Computational Linguistics (ACL)",
    month = jul,
    year = "2020",
    keywords = {pi},
    url = "https://www.aclweb.org/anthology/2020.acl-main.463",
    doi = "10.18653/v1/2020.acl-main.463",
}

Answer 1

We can copy most of the approach from How can I colorise the background of every second bibliography entry with biblatex and just guard the bits that do the highlighting with \ifkeyword{pi}.

\documentclass[fontsize=11pt,twoside,numbers=noendperiod]{scrartcl}
\usepackage[
citestyle=numeric,
bibstyle=authoryear,
sorting=none,
,uniquename=false
,uniquelist=false
,backref=false
,block=space
,maxbibnames=99
,maxcitenames=2
,doi=false
,url=false
,date=year
,backend=bibtex
]{biblatex}
\usepackage{tikz}
\usetikzlibrary{tikzmark}
\usetikzlibrary{calc}
\makeatletter
\input{numeric.bbx}
\makeatother
\setlength{\bibitemsep}{\itemsep}
\newcounter{zebrabibentry}
\newcounter{zebrabibbibenv}
\defbibenvironment{bibliography}
  {\list
     {\ifkeyword{pi}
        {\stepcounter{zebrabibentry}%
         \zebrabibstart{zebrabib-%
           \the\value{zebrabibbibenv}-%
           \the\value{zebrabibentry}}}
        {}%
      \printtext[labelnumberwidth]{%
        \printfield{labelprefix}%
        \printfield{labelnumber}}}
     {\stepcounter{zebrabibbibenv}%
      \setcounter{zebrabibentry}{0}%
      \setlength{\labelwidth}{\labelnumberwidth}%
      \setlength{\leftmargin}{\labelwidth}%
      \setlength{\labelsep}{\biblabelsep}%
      \addtolength{\leftmargin}{\labelsep}%
      \setlength{\itemsep}{\bibitemsep}%
      \setlength{\parsep}{\bibparsep}}%
      \renewcommand*{\makelabel}[1]{\hss##1}}
  {\endlist}
  {\item}
\newcommand*{\zebrabibstart}[2][]{%
  \tikz[remember picture,overlay]
  \draw[line width=1pt,rectangle,
    draw=blue!20,
    fill=blue!10,]
    let \p1=(pic cs:#2) in
    ({0pt,10pt}) node [anchor=base] (#2){} rectangle  (\columnwidth+2pt,\y1-\bibitemsep);%
}
\newcommand\zebrabibend[2][]{%
  \tikz[remember picture with id=#2] \node {#1};}
\renewbibmacro{finentry}{%
  \finentry
  \ifkeyword{pi}
    {\zebrabibend{zebrabib-%
       \the\value{zebrabibbibenv}-%
       \the\value{zebrabibentry}}}
    {}}
\begin{filecontents}{\jobname.bib}
@article{hovy21biases,
  author          = {Dirk Hovy and Shrimai Prabhumoye},
  journal         = {Language and Linguistics Compass},
  number          = {15},
  issue = {8},
  title           = {Five sources of bias in natural language processing},
  year            = {2021},
  doi = {10.1111/lnc3.12432}
}
@inproceedings{bender-koller-2020-climbing,
    title = "Climbing towards {NLU}:
             {On} meaning, form, and understanding in the {Age} of {Data}",
    author = "Bender, Emily M.  and
      Koller, Alexander",
    booktitle = "Proceedings of the 58th Annual Meeting of the
                  Association for Computational Linguistics (ACL)",
    month = jul,
    year = "2020",
    keywords = {pi},
    url = "https://www.aclweb.org/anthology/2020.acl-main.463",
    doi = "10.18653/v1/2020.acl-main.463",
}
\end{filecontents}
\addbibresource{\jobname.bib}
\begin{document}
\autocite{bender-koller-2020-climbing,hovy21biases}
\printbibliography
\end{document}