CSS3 selector (i)

E[att^= ' Val ']

Select any character whose attribute value begins with Val

E[att$= ' Val ']

Select any character with the attribute value ending in Val

E[att*= ' Val ']

Select attribute value contains any character of Val

: Root

HTML layer

: Not ([])

With jquery

: Empty

Select an element without any content

: Target

Target element of a flag that matches the URL of a document

: First-child

Select the first child element of a parent element

: Last-child
: Nth-child (n)

The selector is used to locate one or more specific child elements of a parent element. where "n" is its argument and can be an integer value (1,2,3,4), it can be an expression (2n+1,-n+5), and a keyword (odd, even), but the starting value of parameter n is always 1, not 0. That is, the value of the parameter n is 0 o'clock, and the selector will not select any matching elements.

: Nth-last-child (n)

Evaluates from the last child element of the parent element, as in the previous attribute

: First-of-type:

Specifies the first X element of a parent element

: Nth-of-type (n)

Select a seed element type specified in the parent element

: Nth-last-of-type (n)

Selects a seed element type specified in the parent element, starting from the last child element

: First-of-type

Select is the first child element of a type under the parent element

: Last-of-type

Select is the last child element of a type under the parent element

: Only-child

The selector selects an element that has only one child element and only one child element.

: Only-of-type

The selector selects only one (unique) seed element.

CSS3 selector (i)