3.2 Common parsing grammar
css selector
1, class selector
The class name
2, id selector
#id value
3, the tag selector
Label name
4, descendant selectors
Selector Selector 1 2
5, the sub-selector
The selector 1> selector 2
6, attribute selector
[Property name] # as long as the property name, will be selected
[Attribute name = attribute value] # as long as this attribute names and values are equal, and will be selected
<h1 class="xxx yyy " ></h1>
[class="xxx yyy "][^ Attribute name = value]
[= Value & attribute name]
[Property name = value *]
7, group selector
The selector 1, 2 or selector
8, multiple conditional selector
Selector Selector 2 and 1
p[pro="xxx"]
