共通 CSS3 セレクターのチートシート

Basics selectors

.css3-class {
  font-weight: bold;
}

Selector	Description
`*`	All elements
`div`	Element
`.class`	Class
`#id`	ID
`[disabled]`	Attribute
`[role="dialog"]`	Attribute

Combinators

Selector	Description
`.parent .child`	Descendant
`.parent > .child`	Direct descendant
`.child + .sibling`	Adjacent sibling
`.child ~ .sibling`	Far sibling
`.class1.class2`	Have both classes
`.class1,.class2`	.class1 or .class2

Attribute selectors

Selector	Description
`[role="dialog"]`	`=` Exact
`[class~="box"]`	`~=` Has word
`[class\|="box"]`	`\|=` Exact or prefix (eg, `value-`)
`[href$=".doc"]`	`$=` Ends in
`[href^="/index"]`	`^=` Begins with
`[class*="-is-"]`	`*=` Contains

Pseudo-classes

Selector	Description
`:target`	eg, `h2#foo:target`
`:focus`
`:active`
`:nth-child(3)`	3rd child.
`:nth-child(3n+2)`	2nd child in groups of 3. Using a formula (an + b). Description: a represents a cycle size, n is a counter (starts at 0), and b is an offset value.
`:nth-child(-n+4)`	4, 3, 2, 1 less than 5.
`:nth-last-child(2)`
`:nth-of-type(2)`
`:checked`	Checked inputs
`:disabled`	Disabled elements
`:enabled`	Enabled elements
`:default`	Default element in a group
`:empty`	Elements without children

Pseudo-class variations

Selector
`:first-of-type`
`:last-of-type`
`:nth-of-type(2)`
`:only-of-type`
`:first-child`
`:last-child`
`:nth-child(2)`
`:only-child`
`::first-letter`
`::first-line`