<!DOCTYPE html>
<html>
<head>
<style>
.test:nth-of-type(1)
{
background:-sharpff0000;
}
</style>
</head>
<body>
<h1></h1>
<p class="test">
<p class="test">
.test: what about nth-of-type (1) and nth-of-child (1)?
how do I want the first p.test to turn red
W3C there are several categories of definitions of selectors, including: type, class, id, etc.
the type of the H1 tag is H1, and the type of the p tag is p
description of nth-of-type in the W3C document:
an element's index among elements of the same type (tag name) in their sibling list.
so : nth-of-type (1) is actually used to match the first element in the set of all sibling elements of the same type.
but .test: nth-of-type (1)
the correct matching logic should be:
*:nth-of-type(1) class`.test`wrong matching logic, the cause of the problem
`.test`nth-of-child is the same logic, and if you don't know much about it, you can take a look at the 45th example in my reference below.
refer to
W3C selector4 draft
because there are not enough cases of standard documents in selector3, so I read the draft of 4.
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