Use ::in-range and ::out-of-range pseudo-classes to style input depending on input value. DEMO 1 to 10 are valid. HTML < label > 1 to 10 are valid .</ label > < input type = "number" value = "1" min = "1" max = "10" > CSS input : in - range { background - color: limegreen; } input :out - of - range { background - color: orange; }

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