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How to create cursor trail for drawing on screen?

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Hello, I am wanting to create a function on my website that allows visitors to use their cursor to draw. The visitor is not required to make any selections to do this. I would have an area where as soon as the cursor moves a thin line or trail will be left wherever the cursor goes - effectively allowing them to draw. This trail would remain until they leave or refresh the site. I have seen this done on a website a few years ago but unfortunately I don't have examples to illustrate. Can anyone offer advice as to how this may be done? Would this require JavaScript or something else? Any advice would be greatly appreciated. Thanks Paul

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It would require Javascript, and probably a canvas. I haven't used canvas much, but something that jumps to mind is using the mousemove event to constantly make the pixel at the mouse coordinates black.

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