$VIMRUNTIME/syntax/synload.vim

This files sets up syntax highlighting: it loads the syntax autocommands and sets the default methods for highlighting.

The file is loaded via $VIMRUNTIME/syntax/syntax.vim or $VIMRUNTIME/syntax/manual.vim.

If the variable colors_name was not set, it loads $VIMRUNTIME/syntax/syncolor.vim, otherwise it executes "colors " . colors_name.