how to italic in latex code example

Example 1: latex italic text

\textit{text}

Example 2: latex italic

\emph{accident}

Example 3: bold italic text in latex

\documentclass{article}

\makeatletter
\DeclareRobustCommand\bfseriesitshape{%
  \not@math@alphabet\itshapebfseries\relax
  \fontseries\bfdefault
  \fontshape\itdefault
  \selectfont
}
\makeatother

\DeclareTextFontCommand{\textbfit}{\bfseriesitshape}

\begin{document}

\scshape % now the current font shape is small caps

\textit{\textbf{f}}f

\textbf{\textit{f}}f %% causes LaTeX Font Warning

{\fontseries\bfdefault\textit{f}f}

\textbfit{f}f

\end{document}

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