css - How can I select an nth child without knowing the parent element? -

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i can't figure out way of selecting nth element, last element, or first element in cases don't know parent element. nth-child exists, children, example:

<div>    <p>one</p>    <p>two</p> </div>

p:last-child selects "two" paragraph, , p:first-child selects "one" paragraph. when have dynamic code , have no idea parent name is, or parent (may div, span, anchor, ul, etc.)?

for example:

<youdontknowwhat!>    <p class="select-me">one</p>    <p class="select-me">two</p> </youdontknowwhat!>

how select second paragraph here? (i'm unable select youdontknowwhat! since don't know element (it's hypothetical name).

why there first-child, last-child, , nth-child selectors , no :first, :last, :nth (like .select-me:first)?

how :first different :first-child? every html element child of other element in dom except <html> root element. – boltclock

it'd since don't know parent element. – fomicz

you don't need know parent element :first-child or :nth-child() work. they work, if don't specify parent element.

the following selector guaranteed match appropriate .select-me element regardless of parent element is:

.select-me:nth-child(2)

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