Why put a lang="en" in the <html> tag -


this question has answer here:

normally when write html doc write

<!doctype html> <html> <head> ...

i looking @ source of website other day notice had included langauge attribute in <html> tag read 

<!doctype html> <html lang="en"> <head> ...

any idea why ? guessed may search engines, surly advanced nlp search engines can nowadays work out language page in..

from w3c

this attribute specifies base language of element's attribute values , text content. default value of attribute unknown.

language information specified via lang attribute may used user agent control rendering in variety of ways. situations author-supplied language information may helpful include:

  • assisting search engines
  • assisting speech synthesizers
  • helping user agent select glyph variants high quality typography
  • helping user agent choose set of quotation marks
  • helping user agent make decisions hyphenation, ligatures, , spacing
  • assisting spell checkers , grammar checkers

the lang attribute specifies language of element content , attribute values; whether relevant given attribute depends on syntax , semantics of attribute , operation involved.

for more info on lang attribute


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