Detailed knowledge about css selector
Methods to import external css style sheets
Use the link tag to import external css style sheets
<link rel="stylesheet" href="css/demo01 .css">- ##import (import) external style sheet in the style sheet
@import url("/crazy-html5/06css/css /demo01.css");
headAdd the style tag to the head, and you can add the page style in the style tag.
<head>
<style>
table {
background: #003366;
}
</style>
</head>- Ordinary tag selector
table:{background:red; } - #A tag containing a certain attribute
p[id]{background:red;}Represents a p element containing an id attribute - A tag that contains an attribute and the attribute value is a specific value
p[id=aaa]{background:red;}means it contains the id attribute, and the id =p element of aaa - An element that contains an attribute and the attribute value starts with a specific value
p[id=^aaa]{background:red;}Indicates an element containing an id attribute, and the value of the id is a p element starting with aaa - An element containing a certain attribute and the attribute value ends with a specific value
p [id=$c]{background:red;}means that it contains the id attribute, and the value of id is a p element ending in c
#myp represents the element whose id is myp. The id selector must be preceded by Add the symbol
. must be added in front of the selector, such as .myclass represents all elements whose class value is myclass.
p.important{color:red;}Elements that must meet both selector conditions can take effect.
h1 em{color:red}, this rule will Turn the text of the em element that is a descendant of the h1 element into red. Other em text will not be affected by this rule.
h1>strong{color:red;} acts on the first-level strong element in the h1 element, and other levels are not affected
h1+p {margin-top:50px;}Select the paragraph that appears immediately after the h1 element. The h1 and p elements have the same parent element
h2,p{color:gray;}, will act on both the h2 element and the p element. * is a wildcard selector that can match any element
:first-line{color:red;}
Set a special style for the first line of text:first-letter{color:red;}
Set a special style for the first letter of text
:after, :beforeUnselector
:before{}Can be used to insert content in front of the element content, and the content is availablecontent is specified,
:after{} can be used to insert content after the element content, and the content can be specified with content, such as
p:before{
content:url("img.png");}after, before can be used with quotes, quotes can be used with to set the quote type of nested quotes
<style>
p>p {
quotes: "《" "》"
}
p>p::before{
content: open-quote;
}
p>p::after{
content:close-quote;
}</style>after, before Use with the counter to add multi-level numbers in front of the text. This can be a special article, and I won’t go into details here.
:root
The selector matches the document root element:first-child
Specifies the style when the element is the first child of its parent:last-child
Specifies the style when the element is the first child of its parent The style of the last child of the parent- ##:nth-child(n)
Specifies the style when the element is the nth child of its parent
- odd
Matches the style when the element is an odd number of children of its parent
n is - even
Matches when the element is an even-numbered child of its parent Style
n is - m*n+p
Matches when the element is Its parent conforms to the style of the m*n+p child
- :nth-last-child(n)
Specifies when the element is its parent The style of the nth child from the last level
##:only-child - Specifies that it takes effect when the element is the only child element of its parent
- Specify the style of empty elements
- n is
Pseudo-class selector for element state
:hoverStyle when the mouse pointer is on the element:focusThe style of the element that receives focus:enabledThe style of the enabled element:disabledThe style of the disabled element:checkedThe style of the selected element (checkbox, radio )::selectionThe style of some elements selected by the user:not(selector)Select a style that is not this selector##:target
Select the currently active #news element, generally used with anchor points
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