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When text is written to the identical location more than once it gets darker. Why?
var txt = "The cat is on the mat";
var ctx = c.getContext("2d");
ctx.font = "15px Lucida Sans Unicode";
ctx.fillText(txt,10,50);
ctx.fillText(txt,10,50); // again
ctx.fillText(txt,10,100);
The edges of text are anti-aliased, which means they are blended with the background. When you lay text on top of more text, it’s blending with the anti-aliased edge of the text behind it, making it look aliased and larger (thus darker). Think two pieces of smoked glass set in front of each other.