Where software is not designed to be isolated from its platform, and provides a user interface, that user interface shall follow the values of the user preferences for platform settings for: units of measurement, colour, contrast, font type, font size, and focus cursor except where they are overridden by the user.
NOTE 1: Software that is isolated from its underlying platform has no access to user settings in the platform and thus cannot adhere to them.
NOTE 2: For web content, the underlying platform is the user agent.
NOTE 3: This does not preclude the software from having additional values for a setting as long as there is one mode where the application will follow the system settings even if more restricted.
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Læs klausulen i EN 301 549 version 3.2.1 [engelsk]