Hi, Per CSSWG resolution , 'no-preference' has been removed from the Media Queries Level 5 specification. We (Blink) intend to align with the spec and remove support for the 'no-preference' keyword from Blink. Firefox has also stated that they will follow to do so .
 https://github.com/w3c/csswg-drafts/issues/3857#issuecomment-634779976  https://groups.google.com/a/chromium.org/d/msg/blink-dev/3RhZFvZE1LM/t7BpLBWkAwAJ
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