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Add note about language #521

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merged 3 commits into from Oct 28, 2021
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Add note about language #521

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4b629d0
Add note about language
Jym77 Sep 29, 2021
d9c14ef
Restrict bit about understanding language to some rules.
Jym77 Oct 15, 2021
cf20981
Streamline text
Jym77 Oct 21, 2021
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4 changes: 3 additions & 1 deletion NOTE-act-rules-common-aspects.bs
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Expand Up @@ -64,4 +64,6 @@ Language {#input-aspects-text}

Language, either written or spoken, contained in nodes of the DOM [[DOM]] or accessibility trees may be of interest to ACT Rules that intend to test things like complexity or intention of the language. For example, an ACT Rule might test that paragraphs of text within the DOM tree do not exceed a certain readability score or that the text alternative of an image provides a sufficient description.

The means by which the language is assessed, whether by a person or a machine, is not of importance as long as the assessment meets the criteria defined in [[wcag2-tech-req#humantestable]] [[WCAG]].
Rules can only operate on the Language aspect if the language of a page can be determined. The means by which the language is assessed, whether by a person or a machine, is not of importance as long as the assessment meets the criteria defined in [[wcag2-tech-req#humantestable]] [[WCAG]].

Some rules can only operate on a Language aspect if the language is sufficiently understood, while other rules only require identifying the language. For example, a rule checking that an accessible name is descriptive can only function if the language is understood. A rule checking the correctness of a `lang` attribute requires knowing what language is used, but not the meaning of the words.