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I have a png image with an object on transperent background. This is shown in a browser.

When user hovers PNG image, there is a hover event in javascript. Is it possible to determine if mouse pointer is over transparent area of the PNG image or not?

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In the canvas-enabled browsers yes. You can draw your image on the canvas and then get the color and transparence of the certain pixel.

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Can I draw multiple PNG images on canvas and determine which one of them is hovered(ignoring transparent area of each one)?

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