setAlpha 56 Source/core/html/canvas/Canvas2DContextAttributes.cpp void Canvas2DContextAttributes::setAlpha(bool alpha) setAlpha 1613 Source/core/html/canvas/CanvasRenderingContext2D.cpp void CanvasRenderingContext2D::setAlpha(float alpha) setAlpha 80 Source/core/html/canvas/WebGLContextAttributes.cpp void WebGLContextAttributes::setAlpha(bool alpha)