Selector API - Attribute Selector (AND operation)

A selector that filtered on an attribute.

• An element:
  • with the tag name E
  • that has a foo attribute

E[foo]

• All elements with a foo attribute

*[foo]

• An E element whose foo attribute value is exactly equal to bar

E[foo="bar"]

• All element whose foo attribute value is exactly equal to bar

*[foo="bar"]

• Contains operator ~=

E[foo~="bar"]

• Start with operator ^=

E[foo^="bar"]

• Others

E[foo*="bar"]
E[foo$="bar"]
E[foo|="bar"]

E[foo=foo][bar=bar]

• An ID selector and a class selector (ie selects element with ID “IdName” and the class “className”)

#IdName.className  { color:blue; }
/* shorthand for */
*[id=IdName][class=className] { color:blue; }

• The HTML

<div id="IdName" class="className">The CSS style will be applied on this text</div>
<div>Not on this one</div>

• The result:

• An element selector and a class selector (ie selects element “div” with the class “className”). The point . is a shorthand notation for a class selector

div.className  { color:blue; }
/* equivalent to */
div[class~=className]  { color:blue; }

• The HTML

<div class="className">The CSS style will be applied on this text because it's a div element with the class className</div>
<div>Not on this one because it has no class</div>

• The result:

The start with operator ^= permits to define a starts with comparison

Notation example: A class that starts with the string foo

[class^="foo"]

Full example

• All element with a class that starts with the string foo will get a red color

*[class^="foo"] {
  color: red
}

• The HTML

<p>A paragraph without class</p>
<p class="foo-suffix other-class">A paragraph with a class that starts with foo</p>

• Output: The paragraph with the class foo-suffix is red

• The HTML

<button role="button" aria-label="Delete item 1">Delete</button>

• The CSS

*[role="button"] {
  /* the attribute selector */
	background-color:#44c767;
	border-radius:28px;
	display:inline-block;
	color:#ffffff;
        padding:16px 31px;
}
*[role="button"]:hover {
	background-color:#5cbf2a;
}
*[role="button"]:active {
	position:relative;
	top:1px;
}

• The result: