Add html files to tests folder and run
npm test
/Users/me/Code/test-htmllint/tests/typo.html
line 1 col 1 tag is not closed (E042)
/Users/me/Code/test-htmllint/tests/typo-django.html
line 100 col 1 indenting spaces must be used in groups of 4 (E036)
line 13 col 9 title "{% block title %}{% if self.seo_title %}{{ self.seo_title }}{% else %}{{ self.title }}{% endif %}{% endblock %}{% block title_suffix %}{% endblock %}" exceeds maximum length of 60 (E029)
line 11 col 9 void element should never close itself (E018)
line 12 col 9 void element should never close itself (E018)
line 14 col 9 void element should never close itself (E018)
line 15 col 9 void element should never close itself (E018)
line 23 col 12 value must match the format: dash (E011)
line 23 col 12 value must match the format: dash (E011)
line 23 col 12 value must match the format: dash (E011)
line 23 col 12 value must match the format: dash (E011)
line 45 col 34 attribute names must match the format: dash (E002)
line 51 col 34 attribute names must match the format: dash (E002)
line 64 col 78 value must match the format: dash (E011)
line 64 col 78 value must match the format: dash (E011)
line 64 col 78 value must match the format: dash (E011)
line 64 col 78 value must match the format: dash (E011)
line 64 col 78 value must match the format: dash (E011)
line 64 col 78 value must match the format: dash (E011)
line 2 col 49 text contains improperly escaped characters: (E023)
line 106 col 20 value must match the format: dash (E011)
line 106 col 20 value must match the format: dash (E011)
line 106 col 20 value must match the format: dash (E011)
line 106 col 20 value must match the format: dash (E011)
line 176 col 9 tag is not closed (E042)
The </<div> typo is picked up on line 176. The rest of the errors must be fixed by either adding/changing htmllint rules to adjust for Django templates, or actually be fixed in the html file.