CSS Selectors tutorial

A CSS( Cascading Style Sheet) comprises of style rules that are interpreted by the browser and then applied to the corresponding elements in your document.

A style rule is made of three parts:

SELECTOR:

A selector is an HTML tag at which style will be applied.
This could be any tag like <h1> or <table> etc.
 
PROPERTY:
A property is a type of attribute of HTML tag. Put simply, all the HTML attributes are converted into CSS properties. They could be color or border etc. 

VALUE:
Values are assigned to properties. For example color property can have value either red or #F1F1F1 etc.


CSS-Selectors-tutorial


You can put CSS Style Rule Syntax as follows:

selector { property: value }

Example: 

You can define a table border as follows:  you can read Tables in HTML.

table{ border :1px solid #C00; }


This is the same selector we have seen above. Again one more example to give a color to all level 1 headings :

h1 {
color: #36CFFF;
}
Universal Selector 

Rather than selecting elements of a specific type, the universal selector quite simply matches the name of any element type


* {
color: #36CFFF;
}


This rule renders the content of every element in our document in black.

Descendant Selectors

Suppose you want to apply a style rule to a particular element only when it lies inside a particular element. As given in the following example, style rule will apply to <em> element only when it lies inside <ul> tag. 


ul em{
color: #36CFFF;
}

Class Selectors

You can define style rules based on the class attribute of the elements. All the elements having that class will be formatted according to the defined rule.

.black {
color: #36CFFF;
}


This rule renders the content in black for every element with class attribute set to black in our document. You can make it a bit more particular. For example:

H1.black {
color: green;
}

This rule renders the content in black for only <h1> elements with class attribute set to black.

You can apply more than one class selectors to given element.


<p class= "center bold“ >This para will be styled by the classes center and bold. </p>

Id Selectors 

You can define style rules based on the id attribute of the elements. All the elements having that id will be formatted according to the defined rule.

This rule renders the content in black for every element with id attribute set to black in our document. You can make it a bit more particular.

#black {color: #36CFFF;}
h1#black {color: #36CFFF;}


This rule renders the content in black for only <h1> elements with id attribute set to black
The true power of id selectors is when they are used as the ground work for descendant selectors

#black h2 {color: #36CFFF;} 
In this example all level 2 headings will be displayed in black color only when those headings will lie with in tags having id attribute set to black.

Child Selectors
You have seen descendant selectors. There is one more type of selectors which is very similar to descendants but have different functionality

Body> p {color: #36CFFF; }

This rule will render all the paragraphs in black if they are direct child of <body> element. Other paragraphs put inside other elements like <div> or <td> etc. would not have any effect of this rule.


Multiple Style Rules 

You may need to define multiple style rules for a single element. You can define these rules to combine multiple properties and corresponding values into a single block as defined,


h1{
color: #36CFFF;

font-weight: normal;

letter-spacing: .4em;

text-transform: #36cff;
}
Finely Last Grouping Selectors

You can apply a style to many selectors if you like. Just separate the selectors with a comma.

h1 , h2 , h3 {

color: #36CFFF;

font-weight: normal;

letter-spacing: .4em;

text-transform: #36cff; } 
You can combine various class selectors together as shown below:

#content, #footer , #supplement {

position: absolute;

left: 510px;

width: 200px ;



}

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CSS Selectors tutorial
What is CSS Selectors it's Complete tutorials step by step define their property, Value , universal Selectors Descendant calss id and child
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