Automatically resize images with browser size using CSS

Question

I want all (or just some) of my images getting resized automatically when I resize my browser window. I\'ve found the following code - it doesn\'t do anything though.

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Answer 1

The following works on all browsers for my 200 figures, for any width percentage -- despite being illegal. Jukka said 'Use it anyway.' (The class just floats the image left or right and sets margins.) I can't imagine why this isn't the standard approach!

Change the window width and the image scales obligingly.