$ touch test.html
$ [ -e test.html ] && echo found || echo not found
found
$ [ -e *.html ] && echo found || echo not found
found
$ [[ -e test.html ]] && echo found || echo not found
found
$ [[ -e *.html ]] && echo found || echo not found
not found
$ touch '*.html'
$ [[ -e *.html ]] && echo found || echo not found
found