Google Chrome the default browser.

 For Chrome the file ~/.config/mimeapps.list must contains:

[Default Applications]
x-scheme-handler/http=google-chrome.desktop
text/html=google-chrome.desktop
text/xml=google-chrome.desktop
application/xhtml_xml=google-chrome.desktop
image/webp=google-chrome.desktop
x-scheme-handler/https=google-chrome.desktop
x-scheme-handler/ftp=google-chrome.desktop

[Added Associations]
text/html=google-chrome.desktop;
text/xml=google-chrome.desktop;
application/xhtml_xml=google-chrome.desktop;
image/webp=google-chrome.desktop;
x-scheme-handler/https=google-chrome.desktop;
x-scheme-handler/ftp=google-chrome.desktop;

Try it (must be open in Chrome, if it installed)

xdg-open somehtmlfile.html