Made via LaTeX, using the tikz & tikz-cd packages, as well as the standalone document class.
Compiled using pdflatex. Converted from PDF to SVG using dvisvgm as in dvisvgm --pdf --no-fonts homotopy_extension_property_rotated.pdf. Cropped using Inkscape.
LaTeX source:
\documentclass[tikz]{standalone}\usepackage{tikz-cd}\begin{document}\begin{tikzpicture}[baseline= (a).base]
\node[scale=9] (a) at (0,0)
{\begin{tikzcd}
A \arrow[r, "f_\bullet"]\arrow[d, "\iota"]& Y^I \arrow[d, two heads, "\pi_0"]\\
X \arrow[r, "\tilde{f}_0"]\arrow[ur, dashed, "\tilde{f}_\bullet"]& Y
\end{tikzcd}};
\end{tikzpicture}\end{document}
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The homotopy extension property represented by a commutative diagram.