What's the difference between HTML's and CSS's width attribute?

Question

The codes can be found here:

http://www.w3schools.com/css/tryit.asp?filename=trycss_float_elements

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Answer 1

In the case of images or the canvas element, using CSS to set dimensions changes the element (how it appears on screen) without changing the underlying bitmap (the same number of pixels are still used, but distorted to fit the CSS-specified dimensions), whereas using the HTML tag to set dimensions actually specifies the number of pixels to set for the element.