2.1.1 [CSS3MediaQueries:2010] 4. Media features

V0001:

The specification states that the media features width, height, device-width, device-height, color, color-index, and monochrome should be ignored if the value is negative.

IE9 Mode, IE10 Mode, IE11 Mode, and EdgeHTML Mode (All Versions)

Values greater than -0.001 but less than 0 are rounded to zero and treated as valid and not ignored.