Código Fonte
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var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
context.font = "18pt Helvetica";
context.fillText("No shadow", 90, 40);
context.shadowOffsetX = 3;
context.shadowOffsetY = 3;
context.shadowColor = "rgba(0,0,0,0.3)"; // RGBA red, green, blue, alpha. Alpha parameter 0.0 / 1.0 (transparent / opaque).
context.fillText("Bad shadow", 90, 80);
context.shadowColor = "rgba(0,0,0,0.5)";
context.shadowBlur = 4;
context.fillText("Smooth shadow", 90, 120);
context.shadowColor = "rgba(0,0,0,1)";
context.shadowBlur = 8;
context.fillText("Strong shadow", 90, 160);
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GSO 305 mm
NEQ6 Pro - Roda 5 Filtros Manual
Guia: OAG TSOAG9T2 - ASI120MC
Cannon EOS T3 - QHY163M
ASI120MC, DSI-1 Meade e SPC880