How to apply conditional formatting for only visible cells?

Question

I am using Excel-2010, I have applied 3scale conditional formatting for Excel range A1:F100, on a Dropdown macro hide/unhide will be actioned, and hide/unhide is not sequential,

Answer 1

As commented, it should be something like this:

Sub ject()
    Dim rng As Range
    With Sheet1 '~~> change to your actual sheet
        .Range("A1:F100").FormatConditions.Delete
        Set rng = .Range("A1:F100").SpecialCells(xlCellTypeVisible)
        .Range("A1").FormatConditions.AddColorScale 3
        With .Range("A1").FormatConditions(1)
            With .ColorScaleCriteria(1)
                .Type = xlConditionValueLowestValue
                .FormatColor.Color = RGB(255, 0, 0)
            End With
            With .ColorScaleCriteria(2)
                .Type = xlConditionValuePercentile
                .FormatColor.Color = RGB(255, 255, 0)
            End With
            With .ColorScaleCriteria(3)
                .Type = xlConditionValueHighestValue
                .FormatColor.Color = RGB(0, 255, 0)
            End With
            .ModifyAppliesToRange rng
        End With
    End With
End Sub

Everytime this routine is run or called, it re-applies formatting to visible ranges.
It can be incorporated to an existing code or run separately. HTH.