Haml::Helpers#html_attrs

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Returns a hash containing default assignments for the `xmlns`, `lang`, and `xml:lang`
attributes of the `html` HTML element.
For example,

    %html{html_attrs}

becomes

    <html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en-US' lang='en-US'>

@param lang [String] The value of `xml:lang` and `lang`
@return [{#to_s => String}] The attribute hash
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