I need to build an Extension in typo3 7.6.I include a css file in setup.txt using
page.IncludeCSS = Ext.Path_to_css_file.css
You have to give each css file you want to include a unique key (e.g.
myCssFile1). Also use a colon after the
EXT:. So the correct way of including a CSS file with TypoScript would be
page.includeCSS.myCssFile1 = EXT:my_ext/Path/to/css_file.css