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Element-Specific id Rules
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One nonintuitive variation of an id selector is an element-specific selector like
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p#p2 {background-color: green;}
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This would select only paragraph elements with their id attribute set to "p2" Compare this to a rule like
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#p2 {background-color: green;}
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Introduction to CSS
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which would match any element with an id of "p2" Immediately, you should think that this implies that more than one element can share id values why else would we need to be more specific than a simple id rule Well, within a single document, that is correct, and it is not appropriate to have markup like
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<p id="p2">I am a correctly identified paragraph</p> <div id="p2">Wait you already used that id value!</div> <p>Not <span id="p2">again!!!!</span> You already used the value p2!</p>
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and then use style rules like
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p#p2 {color: red;} div#p2 {background-color: blue; color: white;} span#p2 {color: blue;}
PART II
However, such rules would make sense if this were a linked style sheet used site-wide and we had different elements in different documents all named "p2" The author considers such usage bad style as it assumes that page content is always found within the same document and will never move, which is not always the case A site-wide unique id approach would solve such future problems and would alleviate the need for this type of selector
class Rules
The class attribute is used to define the name(s) of the class(es) to which a particular tag belongs Unlike id values, class values don t have to be unique because many elements can be members of the same class In fact, elements don t even have to be of the same type to be in a common class Writing rules for classes is easy: simply specify the class name of your own choosing, such as nature, with a period before it as the selector:
nature {color: green;}
The use of class is illustrated here:
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Class Selector Example</title> <style type="text/css" media="all"> veryimportant {background-color: yellow;} </style> </head> <body> <h1 class="veryimportant">Example</h1> <p class="veryimportant">This is the first paragraph</p> <p>This is the second paragraph</p> <p class="veryimportant">This is the third paragraph</p> </body> </html>
Part II:
Core Style
O NLINE http://htmlrefcom/ch4/classselectorhtml
The previous example has three elements, each of which has its class attribute set to veryimportant According to the style sheet information, all members of the veryimportant class have a yellow background color:
Other variations on class rules are possible For example, setting all h1 elements of the class veryimportant to have a background color of orange could be written like this:
h1veryimportant {background-color: orange;}
In some ways, you can think of a class rule with a wildcard selector like
*veryimportant {background-color: orange;}
as being the same as the commonly used class selector
veryimportant {background-color: orange;}
While this is syntactically correct, it doesn t add much understanding More interesting and quite underused is the possibility in selectors to combine classes together directly For example, consider the following rule:
h1veryimportantstuff {background-color: green;}
This would match only <h1> tags with class attribute values including veryimportant and stuff Given these rules, the following tags with class attributes would be affected in the various ways indicated:
<h1 class="veryimportant">Has an orange background</h1> <h1 class="veryimportant dummy">Has an orange background</h1> <h1 class="veryimportant stuff">Has a green background</h1> <h1 class="veryimportant dummy stuff">Has a green background</h1> <h1 class="dummy">Default background unless class rule for dummy set</h1>
4:
Introduction to CSS
Notice that the rule for green background matches any <h1> tag that includes the class values veryimportant and stuff but not necessarily uniquely or in order If you are looking to write a rule that matches any single occurrence of a particular group of class values, then the comma operator is in order For example, separating the following three class names by commas
larry, curly, moe {color: red;}
would mean that any element with a single occurrence or more of these class values would be set as red The following is a complete example showing multiple class rules working together:
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