The config file I use for tidy-html5. $ tidy -config <path/to/tidy.conf> input.html > output.html

tidy.conf

# Example tidy-html5 configuration file.

fix-uri: yes
keep-time: yes
hide-comment: yes
indent-cdata: yes
omit-optional-tags: yes
output-encoding: utf8
indent: auto
indent-spaces: 2
tab-size: 2
join-classes: no
logical-emphasis: no
drop-empty-elements: no
anchor-as-name: no
doctype: auto
drop-empty-paras: no
literal-attributes: yes
merge-divs: no
merge-spans: no
numeric-entities: no
preserve-entities: yes
quote-ampersand: no
quote-marks: no
show-body-only: no
wrap: 0
wrap-asp: no
wrap-jste: no
wrap-php: no
wrap-sections: no
tidy-mark: yes
new-blocklevel-tags: article,aside,command,canvas,dialog,details,figcaption,figure,footer,header,hgroup,menu,nav,section,summary,meter,main
new-inline-tags: video,audio,canvas,ruby,rt,rp,time,meter,progress,datalist,keygen,mark,output,source,wbr
force-output: yes
quiet: yes
show-warnings: yes