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The 10 most misleading CSS selectors and css selectors
These selectors include first-child, last-child, only-child, nth-child (n), nth-last-child (n) and first-of-type, last-of-type, only-of-type, nth-of-type (n), nth-last-of-type (n ). Among all the selectors, these ten selectors are probably the ones most easily misunderstood.
1. About n
1) The expression of n is xn + y. Such as 1, 2n, 2n + 1.
2) n of the nth-child (n) series numbers all child elements of the parent element; nth-type-child (n) n in only numbers the same type of elements, ignoring other elements in the middle.
II. E: first-child and E: first-child
The two methods mentioned above are not the same. The difference is that there are no spaces before the first-child, and there are no spaces. The difference is great, which is the most common misunderstanding.
1) E: first-child with no space indicates "select such an Eelement, and E is the first child element of its parent element ";
2) E: first-child with spaces indicates "select the first child element of E".
<Html>
<Head>
<Title> untitled document </title>
<Style type = "text/css">
*{}
# Box {}
# Box. aa {}
</Style>
</Head>
<Body>
<Div id = "box">
<Div class = "aa"> </div>
<Div class = "aa"> </div>
</Div>
</Body>
</Html> This is the correct method. * indicates the global attribute, # banner * {style}
# The common attributes under the banner. The ID is unique and cannot be used repeatedly on the page. The CLASS can be used multiple times.
Class selector in css
This is a special issue in CSS!
You used the selector. XXX {
Color: # ccc;
}
There is no problem at all. If you use the same class for other tags in the HTML document, you just want to apply the style P. XXX {
Color: # ccc;
}
It is important.
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