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The img element is highlighted in the left panel so the information in the right panel refers to it.

The picture shows how the browser 'sees' the image. The numbers will depend on the browser window and will change as you re-size.

Note that you can untick and tick to see what each bit of your CSS is doing.

Even more surprising is the fact that you can change any item - this is how I work out the best vmin values.

But note that these changes are not permanent. Think about it - if they were this would mean that you could go in and change anyone's web pages!

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