Summary of pseudo-class selectors
-
Structural pseudo-class selector Structural pseudo-class selector
It can select elements based on their position in the document. Such elements have a prefix ":"
1 . The root element selector only works on bottom tags such as html. It is rarely used..:root
The selection of all child elements needs to be more detailed. last-child The last one
ul>li:only-child{ } Add the pseudo-class only-child Those with only one will affect the only child
div>p: only-of type{ } Add the pseudo-class only-of-type to select the child element of the specified type. In fact, the function is similar to that of a single div>p
##Pseudo-classes need to add pre-selectors to limit the scope 3. ul>li :nth-child(2) { } The second child element of li under ul
ul>li:nth-last-child(2) { } …. The penultimate one
Others: ##UI pseudo-class selector:enable:disablehtml file -
css file
effect
:checked The checked one takes effect
html file##css file
##css file
css file
:valid Valid when legal
:invalid Valid when illegal
html file
css file
html file
css file
a:link Acts on the text between a tags
Other pseudo-class selectors
:not Inverse selection focuses on
Hyperlinks that do not contain baidu are red
:empty The effect is empty tags, a bit Like word's replacement of spaces means
html file
before replacement
css file
If you want not to affect some empty parts, you can specify such as
p:empty{ } Then the css will only affect Empty tag under p
After replacement
:lang
: target Positioning anchor point within the page, a certain position will take effect immediately
name or id Yes, the anchor can be set in any tag. As for the hyperlink , it is just a hyperlink. Here, enter #anchor name directly in the browser, and the effect is to press href The same after that.
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