Show the bug 4

book/book.tex

@@ -7,10 +7,8 @@
 \usepackage{longtable}
 \usepackage{chemformula}
 \usepackage{chemfig}
-\usepackage{makecell}
 \usepackage[mode=match, reset-text-family=false]{siunitx}
 \usepackage{fontspec}
-\usepackage{calc}
 \usepackage[font={sffamily, sbseries}]{quoting}
 
 % style=nextline breaks on make4ht
@@ -33,14 +31,6 @@
 \DeclareTOCStyleEntry[numwidth=3em]{tocline}{flowchart}
 \DeclareTOCStyleEntry[numwidth=3em]{tocline}{table}
 
-
-% Kerning in footnotes
-\usepackage{fnpct}
-
-% References
-\usepackage[backend=biber]{biblatex}
-\addbibresource{references.bib}
-
 % Clickable links in the table of contents
 \usepackage{hyperref}
 \usepackage{bookmark}