Yes [0]:

> Chrome uses CLD3 to perform language detection on all webpages. This language detection is generally very accurate. Chrome will override the language detection if there is a language attribute on the HTML tag or a language specified in the HTTP content-language header.

> However, both these signals are often incorrectly specified by the site/page, and in particular many non-English sites report the language as English (presumably based on default values from authoring tools, etc.) Currently a whitelist is used to determine if the detected language should always override the language attribute / content-language.

Compact Language Detector v3 (CLD3) is a neural network model for language identification [1]. Sometimes it fails [2].

[0] https://bugs.chromium.org/p/chromium/issues/detail?id=771861

[1] https://github.com/google/cld3

[2] https://bugs.chromium.org/p/chromium/issues/detail?id=105923...

I don't know if it is the case nowadays, but I seem to recall that in the old days they would check and if their model was highly predicting a language different than the one you were claiming they would serve the language they predicted.

Which, even if they don't still do this, I think makes total sense and is what I would do because obviously programmers make mistakes and if your page claims to be English but your language has a high chance of being Armenian and a low chance of being English I would consider it was Armenian.