Where do I specify the language of my website?
According to W3C, you can add lang=”en” (for english) attribute to your HTML tag and this is still valid for HTML5.
Here are some other options for the lang attribute:
“en-US”: the U.S. version of English.
“en-cockney”: the Cockney version of English.
“i-navajo”: the Navajo language spoken by some Native Americans.