jQuery uses andSelf() function method

When we use Destructive Method to select and filter wrapper set, a new result set will be generated. For example:

For the above DOM Tree, of course you can use

$('p').find('p')

to get the p elements contained in all p elements, but the selection result will definitely not contain p element itself.
If you call andSelf() in a chain after find, you can put previous selection($(' p')) is also included in the result set.

Usage example

For the above html code, use

$('p').find('p').css('border', '1px solid #993300');

css effect can only be applied to the p element

But after find(), add andSelf(), css will also apply to all p elements

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