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Re: [csswg-drafts] [mediaqueries][mediaqueries-4] `scan` feature...is there any actual support/need for this?

From: markbrown via GitHub <sysbot+gh@w3.org>
Date: Mon, 23 Jan 2017 12:49:34 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-274480061-1485175773-sysbot+gh@w3.org>
@frivoal Why do you say that everybody must return true to either 
`progressive` or `interlace`?

In [Section 2.4](https://drafts.csswg.org/mediaqueries-4/#mq-features)
 it says:

> If a media feature references a concept which does not exist on the 
device where the UA is running (for example, speech UAs do not have a 
concept of “width”), the media feature must always evaluate to false.

which implies that the options for features are not necessarily 
exhaustive. Also, Example 13 mentions that `(scan)` may evaluate to 
false, meaning that neither value is true.

Given this, is there in fact a difference between the two levels?

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