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[mediaqueries-4] Can't have 'not', 'and' and 'or' at the same level #185

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Jun 15, 2016
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[mediaqueries-4] Can't have 'not', 'and' and 'or' at the same level #185

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9 changes: 4 additions & 5 deletions mediaqueries/Overview.bs
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Expand Up @@ -679,15 +679,14 @@ Combining Media Features {#media-conditions}

* <a>Media conditions</a> can be grouped by wrapping them in parentheses ''()''
which can then be nested within a condition the same as a single media query.
For example, ''not (color) or (hover)''
For example, ''(not (color)) or (hover)''
is true on devices that are monochrome
and/or that have hover capabilities,
because the ''not'' only applies to the immediately following ''(color)'' feature.
and/or that have hover capabilities.
If one instead wanted to query for a device that was monochrome and <em>didn't</em> have hover capabilities,
it must instead be written as ''not ((color) or (hover))''
(or, equivalently, as ''not (color) and not (hover)'').
(or, equivalently, as ''(not (color)) and (not (hover))'').

It is <em>invalid</em> to mix ''and'' and ''or'' at the same “level” of a media query.
It is <em>invalid</em> to mix ''and'' and ''or'' and ''not'' at the same “level” of a media query.
For example, ''(color) and (pointer) or (hover)'' is illegal,
as it's unclear what was meant.
Instead, parentheses can be used to group things using a particular joining keyword,
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