I tested it and it is upper left, not lower left.
This is the CanvasItem shader I used to test it:
shader_type canvas_item;
void fragment() {
if(distance(FRAGCOORD.xy, vec2(40, 40)) < 30.0)
COLOR = vec4(1,0,0,1);
else
COLOR = vec4(0,0,0,1);
}
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The unordered list markup was missing a blank line at the beginning, so it displayed all the list item on a single line of text instead of in a proper bulleted list.
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The reference page suggests a very unfortunate lighting function that modulades the color values in ALBEDO again. This does not seem representative of the shading model.
Also, it omitted LIGHT_COLOR; repalcing the ALBEDO term with LIGHT_COLOR gives a much more expected diffuse lighting example.
dawei-wang