Why doesn't the background image show up without specific width and height?

Question

Here\'s an example code

I\'ve been wondering why the background-image doesn\'t show up unless I specific the image\'s width and height in pixels. I trie

Answer 1

Your

element don't have any content, so the

height is 0px.
The width of the

is still 100%.
If you add any content to the div it will have some height and it will show a portion of image.
by default has the height of the window, so you can see the background-image.

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