Filter example in JQuery docs

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Please explain how the following jquery snippet works

http://pastebin.com/xVWsjj8u

Jquery docs says this code will alter the first list item only, as it contains exactly one “strong” tag

I am confused about the “this” part in the following line of code. I believe “this” returns “li”elements and I can not correlate it with strong

return $(‘strong’, this).length == 1;

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nice @jamy_za
Thank you

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