8/21 EMA Cross with 50 SMA Filter

Key Features:
8/21 EMA Crossover: Detects when the 8 EMA crosses above/below the 21 EMA
50 SMA Filter: Only shows signals when:
Bullish cross occurs AND price is above 50 SMA
Bearish cross occurs AND price is below 50 SMA

Visual Signals: Green "BUY" labels for filtered bullish crosses, red "SELL" labels for filtered bearish crosses
Comparison: Small gray triangles show unfiltered crosses that were rejected by the 50 SMA filter
Trend Background: Light green when above 50 SMA, light red when below
Alerts: Built-in alert conditions for both filtered signals