$('div:nth-child(2)').css ('background', 'red') applied.
div I tried to apply it to my second child,
I don't know why it applies to all children except section data-role=header
$('div:nth-child(1)').When running css('background', 'red')
The first child of div
It applies well to id=dee2.
When CSS instructs div:nth-child(2), what does the browser do to select?
In the given code, $('div:nth-child(2)) is kept by #dee1 and #dee3. Why? Because #dee1 is the second element under the parent section[data-role=page] and #dee3 is the second element under the parent #div1. Give a little transparency to the background and you'll understand the situation better.
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