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There is a newer version: 10.20.0.29356

HTML documents should have a valid IETF’s BCP 47 lang attribute.
Why is this an issue?
Screen readers require a specified language to function correctly. Without it, they default to the user’s set language, causing issues for
multilingual users. Specifying a valid language ensures correct pronunciation and a less confusing experience.
How to fix it
Add a lang attribute with a valid IETF BCP 47 value.
Code examples
Noncompliant code example
<html></html>

Compliant solution
<html lang="en"></html>

Resources
Documentation

   W3C, Language tags in HTML and XML