Adjust monospace font size in LaTeXML build

css/MLS.css

@@ -5,3 +5,8 @@
 /* Undo bold here to remove the browser's native th styling,
  */
 .ltx_th { font-weight:normal; }
+
+/* Compensate for default font size ratio 13:16 for monospace to normal.
+ * 16/13 = 1.2307..., and due to the way we mix inline code with MathJax math, even this is on the small side.
+ */
+.ltx_font_typewriter { font-size:123%; }

preamble.tex

@@ -169,6 +169,15 @@
 \definecolor{keywordcolor1}{rgb}{0,0,.4}
 \definecolor{keywordcolor2}{rgb}{.90,0,0}
 
+% When producing PDF, the ttfamily looks better in size \small, but with LaTeXML this becomes too small,
+% and the size is applied deep down on the HTML elements, making it hard to adjust using CSS.
+% Thus, the problem has to be addressed already when a listings language's 'basicstyle' is defined.
+\ifpdf
+\let\smallifpdf\small
+\else
+\let\smallifpdf\normalsize
+\fi
+
 % See https://github.com/modelica-tools/listings-modelica/blob/master/listings-modelica.cfg
 % Note: Changed comment color from green to [rgb]{0,0.4,0} - since the other variant was too distracting
 % And added pure,impure,stream as keywords
@@ -183,7 +192,7 @@
 % Note that Integer is both a predefined type and a function; we cannot treat them differently.
 % Another solution would be to remove this completely.
 \lstdefinelanguage{modelica}{% Language for use with the lstlisting environment.
-    basicstyle=\upshape\small\ttfamily, % Font size for displayed code listings.
+    basicstyle=\upshape\smallifpdf\ttfamily, % Font size for displayed code listings.
     alsoletter={},
 %   otherkeywords={-, =, +, [, ], (, ), \{, \}, :, *, !},%
     morekeywords=[1]{}, % blue Keywords
@@ -213,7 +222,7 @@
 
 % Note: within only a keyword in grammar
 \lstdefinelanguage{grammar}{%
-    basicstyle=\upshape\small\ttfamily,        % size of fonts used for the code
+    basicstyle=\upshape\smallifpdf\ttfamily, % size of fonts used for the code
     alsoletter={},
     alsodigit={-},
     breaklines=true,
@@ -251,7 +260,7 @@
 
 % Duplicate this definition here to avoid issue - and name it "fortran77" to avoid problem in LatexML
 \lstdefinelanguage{fortran77}{%
-    basicstyle=\upshape\small\ttfamily, % size of fonts used for the code
+    basicstyle=\upshape\smallifpdf\ttfamily, % size of fonts used for the code
     morekeywords={%
         ASSIGN,BACKSPACE,CALL,CHARACTER,%
         CLOSE,COMMON,COMPLEX,CONTINUE,DATA,DIMENSION,DO,DOUBLE,%
@@ -280,7 +289,7 @@
 }[keywords,comments,strings]
 
 \lstdefinelanguage{C}{%
-    basicstyle=\upshape\small\ttfamily, % size of fonts used for the code
+    basicstyle=\upshape\smallifpdf\ttfamily, % size of fonts used for the code
     morekeywords={%
         auto,break,case,char,const,continue,default,do,double,%
         else,enum,extern,float,for,goto,if,int,long,register,return,%